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| Bacterias (f.pl) | Bakterien (f.pl) | Bacteria | Bactéries (f.pl) | Batteri (m.pl) | |
| Balaustre (m) | Geländerstab (m) | Baluster | Balustre | Balaustro (m) | |
| Baldaquín (m) | Baldachin (m) | Balaquin | Baldaquin (m) | Baldacchino (m) | |
| Baldosa (f) / Azulejo (m) | Fliese (f) | Tile | Carreau (m) / Dalle (f) | Mattonella (f) / Piastrella (f) | |
| Banco de carpintero (m) | Hobelbank (f) | Workbench / Joiner's bench / Carpenter's bench | Établi de menuisier (m) / Établi de travail (m) | Banco da lavoro (m) / Banco da falegname (m) | |
| Banco de rincón (m) | Eckbank (f) | Corner bench / seat | Banc de coin (m) | Panchina d'angolo | |
| Band | Band | strip, band | Band | Band | |
| Baquelita (f) | Bakelit (nt) | Bakelite | Backélite (f) | Bachelite (f) | |
| Barandilla (f) / Pasamano (m) | Geländer (nt) | Balustrade / Rail / Hand rail / Railing | Balustrade (f) / Rampe (f) | Ferroviario (m) | |
| Barniz (m) | Firnis (m) | Varnish | Vernis (m) | Vernice (f) | |
| Barniz (m) (para pinturas) | Bilderfirnis (m) | Picture varnish | Vernis de peinture (m) | Vernice dipinti (f) | |
| Barniz de pulimento (m) | Abschlusspolitur (f) | Finish | Finition (f) | Finitura (f) | |
| Barocco (m) | Barock (nt) | Baroque | Baroque (m) | Barocco (m) | |
| Barra de Espagnolette (f) | Espagnolettestange (f) | Espagnolette rod | Tringle Espagnolette (f) | Espagnolette Asta | |
| Barra de cristal (f) | Fenstersprosse (f) | Window lattice / Glazing bar | Barre de vitrage (f) | Barra di smaltatura | |
| Barra de rebaba (f) | Gratleiste (f) | Burr bar / Burr strip / Flash strip | Barre de fraisage (f) | Barra di bava | |
| Barra de techo (f) | Deckenstab (m) | Ceiling rod | Barre de plafond (f) | Asta per soffitto | |
| Barra decorativa convexa (f) | Konvexer Zierstab (m) | Convex decorative trim | Tige décorative convexe (f) | Asta decorativa convessa (f) | |
| Barrera de humedad (f) | Feuchtigkeitssperre (f) | Humidity seal / Moisture barrier | Pare-humidité (m) | Barriera all'umidità | |
| Barrera de vapor (f) | Dampfsperre (f) | Vapour barrier / Moisture barrier / Damp barrier | Pare-vapeur (m) / Barrière de vapeur (f) | Barriera al vapore (f) | |
| Bastidor de madera (m) / Marco de madera (m) | Holzrahmen (m) | Wooden frame | Cadre en bois (m) / Armature en bois (f) | Cornice di legno (f) / Telai in legno | |
| Batiente (m) | Fensterflügel (m) | Window sash / Casement / Window wing | Châssis de fenêtre (m) | Anta della finestra | |
| Batiente vitreo / Talón del cristal | Glasleiste (f) | Glass strip / Glazing strip | Liston vitré / Cordon de vitrage (m) | Barra vitrea / Fermavetro | |
| Benceno | Benzen (nt) | Benzene | Benzéne | Benzene | |
| Benjuí (m) | Benzoeharz (nt) | Benzoe / Styrax resin | Benjoin (m) | Resina di benzoino (f) | |
| Benzotriazol (m) | Benzotriazol (BTA) (nt) | Benzotriazole | Benzotriazole (m) | Benzotriazolo (m) | |
| Berilio (m) | Beryll (m) | Beryl | Béryl (m) | Berillo (m) | |
| Betún (m) | Bitumen (nt) | Bitumen | Bitume (m) | Bitume (m) | |
| Bisagra (f) | Kloben (m) | Bracket / Clamp / Hinge | Charnière (f) | Cerniera (f) | |
| Bisagra de ajuste (f) | Fischband (nt) / Fitschenband (nt) | Fitting hinge | Charnière de fixation (f) | Cerniera di montaggio | |
| Bisagra de ventana (f) | Fensterband (f) | Window ribbon / band | Charnière de fenêtre (f) | Cerniera della finestra | |
| Biselado | Abgeschrägt (adj) | Bevelled | Incliné | Inclinato | |
| Biselado (m) | Fase (f) | Bevel / Chamfer | Angle biseauté | Smusso | |
| Bismuto (m) | Bismut (n) | Bismuth | Bismuth (m) | Bismuto (m) | |
| Bistre (m) | Bister (m) | Bistre | Bistre (m) | Bistro (m) | |
| Biólogo (m) | Biologe (m) | Biologist | Biologiste (m) | Biologo (m) | |
| Blanco de antimonio (m) | Antimonweiß (nt) | Antimony oxide/white | Blanc d'antimoine (m) | Bianco di antimonio (m) | |
| Blanco opaco (m) | Deckweiss (nt) | Opaque white | Blanc opaque (m) | Bianco coprente (m) | |
| Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | Bleiglasfenster-Horizontalstab | |
| Bleilappen | Bleilappen | lug of lead | abergements de plomb | lobo di piombo | |
| Bleistreifen | Bleistreifen | stride of leadcover | bandes de plomb | striatura di biombo | |
| 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 | |
| Bola de torre (f) / Pomo de la torre (m) / Perilla del techo (f) | Turmkugel (f) / Turmknauf (m) / Turmknopf (m) / Dachknauf (m) | Tower sphere / Tower spire / Tower ball / Roof pommel | Bouton de tour (m) / Bouton de porte (m) | Palla torre / Pomolo della torre (m) / Manopola del tetto | |
| Bono de camilla (m) | Läuferverband (m) | Stretcher bond / Stretching bond | Lien de tension (m) | Legante per barella | Laço de maca (m) |
| Borde (m) | Einfassung (f) | Border / Edging / Mount | Lisière (f) | Confine | |
| Borde clásico de la ventana (m) | Klassische Fenstereinfassung (f) | Classic window edging | Bordures de fenêtre classiques (f) | Bordi classici per finestre (m) | |
| Bosquejo (m) | Entwurfszeichnung (f) / Architektenzeichnung (f) | Preliminary sketch / Design drawing / Blueprint | Ébauche (f) | Disegno preparatorio (m) | |
| Brazo de palanca (m) | Hebelarm (m) | Lever / Lever arm / Cantilever arm | Levier (m) Bras de levier (m) | Braccio di leva / Leva | |
| Brettstapelelemente (n) | Brettstapelelemente (n) | board pile elements | Brettstapelelemente (n) | Brettstapelelemente (n) | |
| Brida (f) | Flansch (m) | Flange | Brida (f) | Flangia (f) | |
| Briden (f) | Briden (f) | Briden (f) | brides (f) | Briden (f) | |
| Briden auf Holz | Briden auf Holz | Briden auf Holz | Brides sur bois | Briden auf Holz | |
| Brillo (m) / Esplendor (m) | Glanz (m) | Gloss / Shine / Sheen / Luster | Splendeur (f) / Brillant (m) / Brillance (f) / Éclat (m) | Lucentezza (f) / Fulgore | |
| Brillo (m) / Luminosidad (f) | Helligkeit (f) | Brightness / Light | Luminosité (f) / Clarté (f) / Luminance (f) | Brillantezza (f) / Chiarezza (f) | |
| Bronce (m) | Bronze (f) | Bronze | Bronze (f) | Bronzo (m) | |
| Brustblech | Brustblech | Brustblech | Tablettes | Brustblech | |
| Bruñidor (m) | Achat-Polierstein (m) | Agate burnisher | Brunissoir d'agate (m) | Pietra d'agata (f) | |
| Buhardilla (f) | Dachgaube (f) / Gaube (f) | Dormer (of a roof) | Lucarne (f) / Chien-en-lit / Chien-assis | Abbaino | |
| Burbuja (f) | Blase (f) | Bubble | Bulle (f) | Bolla (f) | |
| Bálsamo (m) | Balsam (m) | Balm | Baume (m) | Balsamo (m) | |
| Bóveda (f) | Gewölbe (nt) | Vault / Arch / Dome | Voûte (f) | Caveau | |
| Bóveda escalonada | Stuferwöhlbung (f) | Stepped arching/curving/vaulting | Voûtes en gradins (f) | Volteggio a gradini | |
| Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | Bündelpfeiler | |
| balcon m. | Balkon | balcony | balcon m. | balcone m. | |
| barrena / trépano con corte de cincel | Bohrer mit Meisselschneide | borer | foreur / perceur | trapano | |
| basa | Basis | foundation | base | basamento | |
| bastion | Bastion (f) | Bastion / Stronghold | bastion | bastione | |
| biodegradable | biologisch abbaubar (adj) | biodegradable | biodégradable | biodegradabile | |
| biológico | biologisch (adj) | biological | biologique | biologico | |
| bol exterior | Aussenschale / Witterungsschutz | outer shell / weather protection | bac exterieur | bacino esterno | |
| bordo | Bord | brim / shelf | bord | bordo | |
| brazo de persiana enrollable | Ausstellschere / Rollladenarm | arm of shutter | bras de volet roulant | braccio di persiana avvolgibile | |
| brillante / luminoso / claro | hell (adj) | bright / light | clair | lucente / chiaro | |
| buffer | Puffer | buffer | boutoir | repulsore | |
| burdo | grob (adj) | rough / coarse | gros | grosso | |
| básico | basisch (adj) | basic | basique | basico | |