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| Backing  | Aufdopplung (f)  | Doublage (m)  | Rintelatura (f)  | Duplicación (en grosor) (f)  |  | 
| Bacteria  | Bakterien (f.pl) | Bactéries (f.pl)  | Batteri (m.pl)  | Bacterias (f.pl) |  | 
| Bakelite  | Bakelit (nt)  | Backélite (f)  | Bachelite (f)  | Baquelita (f)  |  | 
| Balance / Equilibrium  | Gleichgewicht (nt)  | Équilibre (m) | Equilibrio (m) / Bilanciamento (m)  | Equilibrio (m) / Balance (m) |  | 
| Balaquin  | Baldachin (m)  | Baldaquin (m)  | Baldacchino (m)  | Baldaquín (m)  |  | 
| Balm | Balsam (m)  | Baume (m)  | Balsamo (m)  | Bálsamo (m)  |  | 
| Balsa wood  | Balsaholz (nt)  | Balsa (m)  | Balsa (f)  | Madera balsa (f)  |  | 
| Baluster | Geländerstab (m) | Balustre  | Balaustro (m) | Balaustre (m)  |  | 
| Balustrade / Rail / Hand rail / Railing | Geländer (nt) | Balustrade (f) / Rampe (f) | Ferroviario (m) | Barandilla (f) / Pasamano (m) |  | 
| Barberry extract / Berberine  | Berberitzen-Extrakt (m) / Berberin (nt)  | Extrait d'épine-vinette (m)  | Estratto di crespino (m)  | Extracto de berberis (m)  |  | 
| Barium sulfate | Bariumsulfat (nt) / Blanc fix (nt)  | Sulfate de baryum (m)  | Solfato di bario (m)  | Sulfato de bario (m)  |  | 
| Barium yellow | Bariumgelb (nt)  | Jaune de baryum (m)  | Giallo di barite (m)  | Amarillo de bario (m)  |  | 
| Bark | Borke (f)  | Écorce (f) | Corteccia (f) | Corteza (f) |  | 
| Bark  | Baumrinde (f)  | Écorce d'arbre (f)  | Corteccia (f)  | Corteza de árbol (f)  |  | 
| Baroque  | Barock (nt) | Baroque (m)  | Barocco (m) | Barocco (m)  |  | 
| Baroque strapwork  | Bandelwerk (nt) | Garniture de volutes (f)  | Guarnizione barocca alle volute (f)  | Lacería (f)  |  | 
| Barrel ceiling / Cap ceiling | Kappendecke (f) / Preussische Kappendecke (f) / kurz Preussische Kappe (f) / Berliner Gewölbe (nt) | Couvercle du capuchon (m) | Coperchio (m) | Tapa del capuchón (f)  |  | 
| Base  | Sockel (m)  | Socle (m)  | Base (f)  | Zarpa (f)  |  | 
| Base coat / Base layer / Primer | Grundanstrich (m)  | Fond (m)  | Fondo (m)  | Imprimación (f)  |  | 
| Base tube / Plinth tube | Sockelrohr (nt) / Gussstiefel (m) | Tube de base (m)  | Tubo base (m)  | Tubo base (m) |  | 
| Basket arch with four anchor points | Korbbogen mit vier Einsatzpunkten (m)  | Arc de panier avec quatre points d'application (m)  | Arco del cestello con quattro punti di applicazione (m)  | Arco de cesta con cuatro puntos de aplicación (m)  |  | 
| Basket arch with three anchor points | Korbbogen mit drei Einsatzpunkten (m)  | Arc de panier avec trois points d'application (m)  | Arco del cestello con tre punti di applicazione (m)  | Arco de cesta con tres puntos de aplicación (m)  |  | 
| Bast  | Bast (m)  | Raphia (m)  | Rafia (f)  | Ráfia (f)  |  | 
| Bastion / Stronghold | Bastion (f)  | bastion | bastione | bastion |  | 
| Bavarian blue  | Bayerischblau (nt)  | Bleu de Bavière (m)  | Blu bavarese (m)  | Azul de Baviera (m)  |  | 
| Beaker  | Becherglas (nt)  | Bécher (m)  | Becher (m) | Vaso (m)  |  | 
| Beam / Joist  | Balken (m)  | Poutre (f) | Trave (f) | Viga (f) |  | 
| Beams (pl) / Entablature / Timberwork  | Gebälk (nt) / Entablatur (f)  | Charpente (f) / Entablement (m) | Trabeazione (f) | Entablamento (m) |  | 
| Beech | Buche (f) / Buchenholz (nt)  | Hêtre (m) | Faggio (m)  | Haya (f) |  | 
| Beeswax | Bienenwachs (nt)  | Cire d'abeille (f)  | Cera d'api (f)  | Cera de abeja (f)  |  | 
| Bell chamber | Glockenkammer (f)  | Chambre de cloche (f) | Campana | Cámara acorazada (f) |  | 
| Benzene  | Benzen (nt)  | Benzéne | Benzene | Benceno  |  | 
| Benzoe / Styrax resin  | Benzoeharz (nt)  | Benjoin (m)  | Resina di benzoino (f)  | Benjuí (m)  |  | 
| Benzotriazole  | Benzotriazol (BTA) (nt)  | Benzotriazole (m)  | Benzotriazolo (m)  | Benzotriazol (m)  |  | 
| Berlin blue  | Berliner Blau (nt)  | Bleu de Berlin (m)  | Blu di Berlino (m)  | Azul de Berlín (m)  |  | 
| Beryl  | Beryll (m)  | Béryl (m)  | Berillo (m)  | Berilio (m)  |  | 
| Bevel / Chamfer | Fase (f)  | Angle biseauté | Smusso | Biselado (m)  |  | 
| Bevel lap joint / Corner half lap joint with double dovetail | Klemmblatt (nt) / Druckblatt (nt) / Französisches Blatt (nt)  | Demi-joint d'angle avec double queue d'aronde (m)  | Metà giro d'angolo con doppia coda di rondine (m)  | Articulación angular de media vuelta con doble cola de milano (f)  |  | 
| Bevelled | Abgeschrägt (adj) | Incliné | Inclinato  | Biselado  |  | 
| Bezel / Reveal edging / Soffit border | Leibungseinfassung (f)  | Révéler l'arête (f) / Garnitures de montants | Rilevamento bordi (m) / Bordatura di spalletta | Revelar borde (m) / Cenefa intradós | Revelar borda (f)  | 
| Biedermeier style  | Biedermeierstil (nt)  | Biedermeier (m)  | Stile Biedermeier (m)  | Estilo Biedermeier (m)  |  | 
| Billet / Truncheon | Knüppel  (m)  | Billette (f)  | Billetta | Palanquilla (f) / Palo (m) / Garrote (m)  |  | 
| Binder  | Bindemittel (nt)  | Liant (m)  | Legante (m)  | Aglutinate (m)  |  | 
| Binding / Cohesion  | Bindung (f)  | Liaison (f)  | Legame (m)  | Cohesión (m)  |  | 
| Binocular microscope  | Binokularmikroskop (nt) | Microscope binoculaire (m)  | Microscopio biocolare (m)  | Microscopio binocular (m)  |  | 
| Biological organisms (pl)  | Bioorganismen (m.pl)  | Organismes biologiques (m.pl)  | Organismi biologici (m.pl)  | Organismos biológicos (m.pl)  |  | 
| Biologist  | Biologe (m)  | Biologiste (m)  | Biologo (m)  | Biólogo (m)  |  | 
| Birch  | Birke (f) / Birkenholz (nt)  | Bouleau (m) (Bois de bouleau, m)  | Betulla (Legno di betulla, m)  | Abedul (m) (Madera de abedul, f)  |  | 
| Bismuth  | Bismut (n)  | Bismuth (m)  | Bismuto (m)  | Bismuto (m)  |  | 
| Bistre  | Bister (m)  | Bistre (m)  | Bistro (m)  | Bistre (m)  |  | 
| Bitumen  | Bitumen (nt)  | Bitume (m)  | Bitume (m)  | Betún (m)  |  | 
| Blastpin | Blastzapfen (m ) | Sarbacane (f)  | Cannello (m)  | Cerbatana (f)  |  | 
| Bleeding (of pigments)  | Ausbluten (von Farbmitteln) (n)  | Dégorgement (de pigments) (m)  | Decolorazione (di pigmenti) (f)  | Sangrado (de pigmentos) (m)  |  | 
| Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab |  | 
| Blistering  | Blasenbildung (f)  | Formation de bulles (f)  | Formazione di bolle (f)  | Formación de burbujas (f)  |  | 
| Blunt joint / Blunt connection / Straight connection  | Stumpfer Stoss (m) /  Gerader Stoss (m)  | Articulation émoussée (f)  | Giunto smussato (m)  | Articulación roma (f)  |  | 
| Board / Plank | Brett (nt) / Diele (f)  | Planche (f)  | L'asse (f) / Tavola (f) | Sofito (m) / Tabla (f)  |  | 
| Bogenbinder | Bogenbinder | Bogenbinder | Bogenbinder | Bogenbinder |  | 
| Bogennische mit Statue | Bogennische mit Statue | Bogennische mit Statue | Bogennische mit Statue | Bogennische mit Statue |  | 
| Bogenrücken | Bogenrücken | Bogenrücken | Bogenrücken | Bogenrücken |  | 
| Boiler / Heating boiler | Heizkessel (m) | Chaudière (f)  | Caldaie di riscaldamento | Caldera (f) / Caldera de calefacción (f) |  | 
| Border / Edging / Mount | Einfassung (f)  | Lisière (f) | Confine  | Borde (m) |  | 
| Boundary / Border / Frontier | Grenze (f)  | Bord (m) / Frontière (f) / Limite (f) | Limite (m) / Frontaliera (f)  | Límite (m) / Frontera (f) |  | 
| Box element | Kastenelement (nt) | Élément de bac (m) / Élément de boîte (m)  | Elemento scatola (m) / Elementi di box (m) | Elemento de caja (m)  |  | 
| Bracket / Clamp / Hinge | Kloben (m) | Charnière (f) | Cerniera (f)  | Bisagra (f) |  | 
| Branch  | Ast (m)  | Branche (f)  | Ramo (m)  | Rama (f)  |  | 
| Branches | Astwerk (n) (Äste (pl))  | Rameaux (m.pl)  | Rami (m.pl)  | Ramificaciones  (f.pl) |  | 
| Brass | Messing (nt)  | Laiton (m)  | Ottone (m)  | Latón (m) / Bronce m | Latão (m) / Bronze (m) / Cobre (m)  | 
| Brazil wood | Brazilholz (nt) / Fernambukholz (nt)  | Pernambouc (m)  | Pernambuco (m)  | Pernambuco (m) |  | 
| Breathing protection | Atemschutz (m) | Appareil respiratoire (m) | Protezione vie respiratorie (f) | Protección respiratoria (f) |  | 
| Briden (f) | Briden (f) | brides (f) | Briden (f) | Briden (f) |  | 
| Briden auf Holz | Briden auf Holz | Brides sur bois | Briden auf Holz | Briden auf Holz |  | 
| Bridle joint | Scherblatt (nt) | Joint à bride (m) | Giunto a briglia (m)  | Articulación de la brida (f)  |  | 
| Brightness / Light | Helligkeit (f)  | Luminosité (f) / Clarté (f) / Luminance (f)  | Brillantezza (f) / Chiarezza (f)  | Brillo (m) / Luminosidad (f) |  | 
| Bronze | Bronze (f)  | Bronze (f)  | Bronzo (m)  | Bronce (m)  |  | 
| Brush  | Bürste (f)  | Brosse (f) | Spazzola (f)  | Cepillo (m)  |  | 
| Brustblech | Brustblech | Tablettes | Brustblech | Brustblech |  | 
| Bubble  | Blase (f)  | Bulle (f)  | Bolla (f)  | Burbuja (f)  |  | 
| Bulge / Protrusion  | Ausbuchtung (f) / Beule (f)  | Renflement (m) / Protubérance (f)  | Slargo (m) / Ammaccatura (f)  | Sinuosidad (f) / Protuberacia (f)  |  | 
| Burl | Maserknolle (f) / Maserkropf (m) / Holzkropf (m)  | Ronce  | Radica (f)  | Nudo (m)  | Arroto (m)  | 
| Burr | Graten (nt)  | Bardanes | Frese | Rebabas |  | 
| Burr bar / Burr strip / Flash strip  | Gratleiste (f) | Barre de fraisage (f)  | Barra di bava | Barra de rebaba (f) |  | 
| Butt joint | Stossverbindung (f)  | Joint vif (m) | Giunto di testa (m)  | Junta plana (f)  |  | 
| Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | Bündelpfeiler |  | 
| baffle plate | Schlagleiste | moulure, liston | listello | franja |  | 
| balcony | Balkon | balcon m. | balcone m. | balcon m. |  | 
| baluster | Treppenpfosten |  |  | poste de la barandilla |  | 
| band, strip | Band | Band | Band | Band |  | 
| barrel roof | Tonnendach | toit de baril | tetto barile |  |  | 
| base | Sohle | semelle | fondo / suola | planta / suela |  | 
| base plate / foundation mat | Fundamentplatte | plaque de fondation / base | piastra di fondazione | placa base |  | 
| basic | basisch (adj)  | basique | basico  | básico  |  | 
| battlement | Zinne | créneau m. | merlo m. | almena |  | 
| battlements roof | Zinnendach |  |  |  |  | 
| beam floor / joist ceiling / single floor / span ceiling | Balkendecke (f) | plafond (m) de barre (f) | soffitto (m) di barra (f) | cobertura (f) de viga (f) |  | 
| beam floor / joist ceiling / single floor / span ceiling with plate | Plattenbalkendecke (f)	 | plafond (m) de barre (f) avec plaque (f) | soffitto (m) di barra (f) con distro (m) / piastra (f) | cobertura (f) de viga (f) con disco (m) / placa (f) |  | 
| bearing distance, span | Spannweite | Spannweite | Spannweite | Spannweite |  | 
| bend | biegen (v)  | plier  | piegare | combar |  | 
| bevel | Schmiege | Schmiege | Schmiege | Schmiege |  | 
| bind  | binden (v)  | lier  | legare  | ligar  |  | 
| biodegradable  | biologisch abbaubar (adj) | biodégradable  | biodegradabile  | biodegradable |  | 
| biological  | biologisch (adj)  | biologique  | biologico  | biológico  |  | 
| blinding concrete / 	granular sub-grade course | Sauberkeitsschicht | Sauberkeitsschicht | Sauberkeitsschicht | Sauberkeitsschicht |  | 
| board pile elements | Brettstapelelemente (n) | Brettstapelelemente (n) | Brettstapelelemente (n) | Brettstapelelemente (n) |  | 
| boarding / formwork / shutter | Schalung (f) bei Wandauflager | coffrage (m) | cassaforma (f) / cassero (m) | encofrado (m) / revestimiento (m) |  | 
| boarding / formwork / shutter on border joist | Schalung (f) bei Randunterzug | coffrage (m) reprise (f) en sous-oeuvre (f) bordière | cassaforma (f) / cassero (m) | encofrado (m) / revestimiento (m) en jácena (f) / sopanda (f) marginal |  | 
| boarding / formwork / shutter, casing / coating / cover / overlay | Schalung (f), Überzug (m) | coffrage (m), 	recouvrement (m) / housse (f) | cassaforma (f) / cassero (m), copertura (f) / fodera (f) | encofrado (m) / revestimiento (m), forro (m) |  | 
| boarding / formwork / shutter, joist / binding beam | Schalung (f), Unterzug (m) | coffrage (m), reprise (f) en sous-oeuvre (f) | cassaforma (f) / cassero (m) | encofrado (m) / revestimiento (m), jácena (f) / sopanda (f) |  | 
| bonded wooden truss | verleimte Holzbinder (m) |  |  |  |  | 
| borer | Bohrer mit Meisselschneide | foreur / perceur | trapano | barrena / trépano con corte de cincel |  | 
| break | aufbrechen (etwas) (v)  | se briser  | interruzione  | romperse |  | 
| brick filler | Ausgleichsstein | pierre pour compensation | pietra per	aggiustamento | piedra por compensación |  | 
| bright / light | hell (adj)  | clair  | lucente / chiaro  | brillante / luminoso / claro  |  | 
| brim / shelf | Bord | bord | bordo | bordo |  | 
| broad / charring chisel | Scharriereisen | Scharriereisen | Scharriereisen | Scharriereisen |  | 
| bubble (form) | blasen bilden (v)  | former des bulles  | fare le bolle  | formar burbujas  |  | 
| buffer | Puffer | boutoir | repulsore | buffer |  | 
| bulge / hollow out  | ausbuchten (v)  | bomber  | bombare  | abombarse |  | 
| bush hammer | Stockhammer | Stockhammer | Stockhammer | Stockhammer |  | 
| butt joint | Stossfuge | joint serré | Stossfuge | llaga |  | 
| buttress, abutment pier, counterfort | Strebepfeiler | Strebepfeiler | Strebepfeiler | Strebepfeiler |  |