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| Backélite (f) | Bakelit (nt) | Bakelite | Bachelite (f) | Baquelita (f) | |
| Bactéries (f.pl) | Bakterien (f.pl) | Bacteria | Batteri (m.pl) | Bacterias (f.pl) | |
| Baldaquin (m) | Baldachin (m) | Balaquin | Baldacchino (m) | Baldaquín (m) | |
| Balsa (m) | Balsaholz (nt) | Balsa wood | Balsa (f) | Madera balsa (f) | |
| Balustrade (f) / Rampe (f) | Geländer (nt) | Balustrade / Rail / Hand rail / Railing | Ferroviario (m) | Barandilla (f) / Pasamano (m) | |
| Balustre | Geländerstab (m) | Baluster | Balaustro (m) | Balaustre (m) | |
| Banc de coin (m) | Eckbank (f) | Corner bench / seat | Panchina d'angolo | Banco de rincón (m) | |
| Band | Band | strip, band | Band | Band | |
| Bande de pilastre d'angle (f) | Ecklisene (f) | Corner pilaster strip | Lesene d'angolo | Listón de esquina de pilastra (m) | |
| Bande de protection (f) | Deckleiste (f) | Cover strip/bar | Striscia di copertura | Tira de recubrimiento (f) | |
| Bande de suspension (f) | Einhängestreifen (m.pl) | Hanging strip | Striscia sospesa | Tira para colgar (f) | |
| Bande perforante (f) | Einbohrband (nt) | Drill-in hinge | Nastro noioso | Cinta perforadora (f) | |
| Bandeau (m) | Kopfband (nt) / Bug (m) / Kopfbüge (f) | Strut / Brace | Longherone (m) / Contraffisso (m) | Puntal (m) / Riostra (f) | |
| Bardanes | Graten (nt) | Burr | Frese | Rebabas | |
| Baroque (m) | Barock (nt) | Baroque | Barocco (m) | Barocco (m) | |
| Barre de fraisage (f) | Gratleiste (f) | Burr bar / Burr strip / Flash strip | Barra di bava | Barra de rebaba (f) | |
| Barre de plafond (f) | Deckenstab (m) | Ceiling rod | Asta per soffitto | Barra de techo (f) | |
| Barre de vitrage (f) | Fenstersprosse (f) | Window lattice / Glazing bar | Barra di smaltatura | Barra de cristal (f) | |
| Barre métallique (f) / Tige métallique (f) | Metallstab (m) | Metal strut / Metal bar | Sta metallica | Varilla metálica (f) / Varilla de metal (f) | Haste de metal (f) / Haste metálica (f) |
| Barreau croisé (m) / Barreau transversal (m) | Kreuzsprosse (f) | Glazing bar / Cross bar | Piolo incrociato (m) / Piolo trasversale (m) | Travesaño de ventana (m) / Peldaño transversal (m) | |
| Baume (m) | Balsam (m) | Balm | Balsamo (m) | Bálsamo (m) | |
| Benjoin (m) | Benzoeharz (nt) | Benzoe / Styrax resin | Resina di benzoino (f) | Benjuí (m) | |
| Benzotriazole (m) | Benzotriazol (BTA) (nt) | Benzotriazole | Benzotriazolo (m) | Benzotriazol (m) | |
| Benzéne | Benzen (nt) | Benzene | Benzene | Benceno | |
| Biedermeier (m) | Biedermeierstil (nt) | Biedermeier style | Stile Biedermeier (m) | Estilo Biedermeier (m) | |
| Billette (f) | Knüppel (m) | Billet / Truncheon | Billetta | Palanquilla (f) / Palo (m) / Garrote (m) | |
| Biologiste (m) | Biologe (m) | Biologist | Biologo (m) | Biólogo (m) | |
| Bismuth (m) | Bismut (n) | Bismuth | Bismuto (m) | Bismuto (m) | |
| Bistre (m) | Bister (m) | Bistre | Bistro (m) | Bistre (m) | |
| Bitume (m) | Bitumen (nt) | Bitumen | Bitume (m) | Betún (m) | |
| Blanc d'antimoine (m) | Antimonweiß (nt) | Antimony oxide/white | Bianco di antimonio (m) | Blanco de antimonio (m) | |
| Blanc opaque (m) | Deckweiss (nt) | Opaque white | Bianco coprente (m) | Blanco opaco (m) | |
| Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | |
| Bleu d'alizarine (m) | Alizarinblau (nt) | Alizarin (Blue) | Blu d'alizarina (m) | Azul de alizarina (m) | |
| Bleu d'anthracène (m) | Anthrazenblau (nt) | Anthracene blue | Blu antracite (m) | Azul de antraceno (m) | |
| Bleu de Bavière (m) | Bayerischblau (nt) | Bavarian blue | Blu bavarese (m) | Azul de Baviera (m) | |
| Bleu de Berlin (m) | Berliner Blau (nt) | Berlin blue | Blu di Berlino (m) | Azul de Berlín (m) | |
| Bleu égyptien (m) | Ägyptischblau (nt.) | Egyptian blue | Blu egiziano (m) | Azul egipcio (m) | |
| 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 | |
| Bois (m) | Holz (nt) | Wood | Legno (m) | Madera (f) | |
| Bois de cerisier (m) / Cerise (f) / Cerisier (m) | Kirschbaum (m) | Cherry tree | Ciliegio (m) / Ciliegina (f) | Cerezo (m) / Madera de cerezo (f) | |
| Bois de charpente (m) | Bauholz (nt) | Timber | Legname da costruzione (m) | Madera labrada (f) | |
| Bois de loupe (m) / Bois ronceux (m) | Maserholz (nt) | Veined wood / Grained wood | Legno di radica (m) / Legno venato (m) | Madera de nudo (f) / Madera veteada (f) | Madeira de burl (f) |
| Bois dur (m) / Feuillu (m) | Hartholz (nt) | Hardwood | Legno duro (m) | Madera dura (f) / Madera noble (f) | |
| Bois-ciment (m) / Pâte à bois (f) | Holzkitt (m) | Wood cement / Wood putty / Wood filler | Cemento legno (m) / Stucco di legno (m) | Cemento de madera (m) / Masilla para madera (f) | |
| Bord (m) / Frontière (f) / Limite (f) | Grenze (f) | Boundary / Border / Frontier | Limite (m) / Frontaliera (f) | Límite (m) / Frontera (f) | |
| Bord (m) / Lisière (f) | Kante (f) | Edge | Spigolo (m) | Canto (m) / Borde (m) / Arista (f) / Reborde (m) | |
| Bordures de fenêtre classiques (f) | Klassische Fenstereinfassung (f) | Classic window edging | Bordi classici per finestre (m) | Borde clásico de la ventana (m) | |
| Boucher | Abdichten (v) | Seal(up) | Tappare | Tapar | |
| Bouleau (m) (Bois de bouleau, m) | Birke (f) / Birkenholz (nt) | Birch | Betulla (Legno di betulla, m) | Abedul (m) (Madera de abedul, f) | |
| Boulon (m) (colombage) | Fachriegel (m) / Riegel (m) (Fachwerk) | Crossbeam ( framework) | Bullone (a traliccio) | Perno (m) (con entramado de madera) | |
| Bouton de tour (m) / Bouton de porte (m) | Turmkugel (f) / Turmknauf (m) / Turmknopf (m) / Dachknauf (m) | Tower sphere / Tower spire / Tower ball / Roof pommel | Palla torre / Pomolo della torre (m) / Manopola del tetto | Bola de torre (f) / Pomo de la torre (m) / Perilla del techo (f) | |
| Boîte de peintures à l'eau (f) | Aquarellfarbkasten (m) | Set of watercolours | Scatola acquarelli (f) | Estuche de acuarelas (m) | |
| Branche (f) | Ast (m) | Branch | Ramo (m) | Rama (f) | |
| Braun d'anthracène (m) | Anthrazenbraun (nt) | Anthracene brown | Bruno antracite (m) | Marrón de atraceno (m) | |
| Brettstapelelemente (n) | Brettstapelelemente (n) | board pile elements | Brettstapelelemente (n) | Brettstapelelemente (n) | |
| Brida (f) | Flansch (m) | Flange | Flangia (f) | Brida (f) | |
| Brides sur bois | Briden auf Holz | Briden auf Holz | Briden auf Holz | Briden auf Holz | |
| Brique d'argile (f) / Brique en terre cuite (f) | Lehmziegel (m) | Adobe / Clay brick | Mattone argilloso | Adobe (m) / Ladrillo cerámico (m) | Tijolo de argila (m) |
| Brique de verre (f) / Bloc de verre (m) | Glasbaustein (m) | Glass brick / Glass block | Mattone di vetro | Ladrillo de vidrio (m) / Bloque de vidrio (m) | |
| Bronze (f) | Bronze (f) | Bronze | Bronzo (m) | Bronce (m) | |
| Brosse (f) | Bürste (f) | Brush | Spazzola (f) | Cepillo (m) | |
| Bruit (m) | Lärm (m) | Noise / Din | Baccano | Ruido (m) / Bullicio (m) | Ruído (m) / Barulho (m) |
| Brunissoir d'agate (m) | Achat-Polierstein (m) | Agate burnisher | Pietra d'agata (f) | Bruñidor (m) | |
| Bulle (f) | Blase (f) | Bubble | Bolla (f) | Burbuja (f) | |
| Burin (m) / Ciseau (m) | Meissel (m) | Chisel | Cesello (m) / Scalpello (m) | Cincel (m) | Cinzel (m) / Talhadeira (f) / Formão (m) |
| Burin creux (m) / Gouge (f) | Hohleisen (nt) / Hohlbeitel (m) / Hohlmeissel (m) | Hollow chisel / Gouge | Scalpello cavo (m) / Sgorbia (f) | Cincel hueco (m) / Escoplo (m) / Gubia (f) | |
| Bécher (m) | Becherglas (nt) | Beaker | Becher (m) | Vaso (m) | |
| Béryl (m) | Beryll (m) | Beryl | Berillo (m) | Berilio (m) | |
| Béton (m) | Beton (m) | Concrete | Cemento (m) | Concreto (m) | |
| Béton avec fibre (m) | Faserbeton (m) | Fibre concrete | Fibrocemento | Hormigón con fibras (m) | |
| Béton cellulaire (m) / Béton poreux (m) | Gasbeton (m) / Porenbeton (m) | Gas concrete / Porous concrete / Aerated concrete / Cellular concrete | Calcestruzzo cellulare | Hormigón celular (m) / Hormigón poroso (m) / Concreto poroso (m) | |
| Béton léger (m) / Béton cellulaire (m) / Béton allégé (m) | Leichtbeton (m) / Ärmedämmbeton (m) / Dämmbeton (m) / Isolationsbeton (m) | Lightweight concrete / Light concrete / Aerated concrete / Gas concrete | Calcestruzzo leggero | Hormigón ligero (m) / Hormigón aligerado (m) | Betão celular (m) / Concreto leve (m) |
| Béton maigre (m) | Magerbeton (m) | Lean concrete / Poor concrete | Calcestruzzo magro (m) | Hormigón pobre (m) | Betão leve (m) |
| Béton moulé (m) / Béton coulé (m) | Gussbeton (m) / gegossener Beton (m) | Cast concrete | Cemento a presa rapida (m) | Concreto vaciado (m) / Hormigón (m) | |
| Bûcheron (m) | Holzfäller (m) | Lumberjack / Woodcutter / Logger | Boscaiolo (m) / Taglialegna | Leñador (m) | |
| Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | |
| bac exterieur | Aussenschale / Witterungsschutz | outer shell / weather protection | bacino esterno | bol exterior | |
| balcon m. | Balkon | balcony | balcone m. | balcon m. | |
| bande d'angle | Winkelband | angle band | spalletta | cinta angular | |
| bandes de plomb | Bleistreifen | stride of leadcover | striatura di biombo | Bleistreifen | |
| barbacane f. | Barbakane | | | | |
| barre de traction | Zugstange / Zugleiste | drawbar / connecting rod | Zugstange / Zugleiste | Zugstange / Zugleiste | |
| base | Basis | foundation | basamento | basa | |
| basique | basisch (adj) | basic | basico | básico | |
| bastion | Bastion (f) | Bastion / Stronghold | bastione | bastion | |
| bicorne / smille | Zweispitz | pick | feluca | pica / escoda | |
| billot portant | Tragklotz | supporting block | blocco portante | armatoste portante | |
| biodégradable | biologisch abbaubar (adj) | biodegradable | biodegradabile | biodegradable | |
| biologique | biologisch (adj) | biological | biologico | biológico | |
| bomber | ausbuchten (v) | bulge / hollow out | bombare | abombarse | |
| bord | Bord | brim / shelf | bordo | bordo | |
| bouchon | Zapfen | pivot | dente | perno | |
| boulon d'arrêt | Anschlagkopf | stop pin | perno d'arresto | perno de tope | |
| boutoir | Puffer | buffer | repulsore | buffer | |
| bras de volet roulant | Ausstellschere / Rollladenarm | arm of shutter | braccio di persiana avvolgibile | brazo de persiana enrollable | |
| brides (f) | Briden (f) | Briden (f) | Briden (f) | Briden (f) | |
| brique f. | Backstein | (red) brick | mattone | ladrillo | |
| broyer | anreiben (Pigmente) (v) | grind | diluire | mezclar (pigmentos) | |