| bracelet | brazalete |
| bracer | estimulante |
| braces | tirantes |
| brachial | braquial |
| Brachial plexus | Plexo braquial |
| Brachiocephalic artery | Tronco braquiocefálico |
| brachiopod | braquiópodo |
| brachioproctic | braquioproctal |
| brachiosaur | braquiosaurio |
| Brachyceratops | Brachyceratops |
| Brachylophosaurus | Brachylophosaurus |
| Brachylophus | Brachylophus |
| Brachylophus vitiensis | Brachylophus vitiensis |
| Brachypodium | Brachypodium |
| brachyuran | perteneciente a los braquiuros |
| bracing | tónico |
| bracken | helecho |
| bracket | anaquel |
| bracketing | poner entre paréntesis |
| brackets | paréntesis |
| Brackett series | Serie de Brackett |
| brackish | salado |
| brackish water | agua salobre |
| braconid | bracónido |
| Braconidae | Braconidae |
| bract | bráctea |
| brad | puntilla |
| Brad Bird | Brad Bird |
| Brad Delson | Brad Delson |
| Brad Pitt | Brad Pitt |
| Brad Will | Brad Will |
| bradawl | lezna |
| Bradford | Bradford |
| Bradford County | Condado de Bradford |
| Bradford fire | Bradford City Association Football Club |
| Bradley Center | Bradley Center |
| Bradley Joseph | Bradley Joseph |
| Brady Bonds | Plan Brady |
| bradycardia | bradicardia |
| Bradykinin | Bradiquinina |
| brae | ladera de monte |
| brag | jactarse |
| Braga | Braga |
| Braga Cathedral | Catedral de Braga |
| Braganza | Braganza |
| Bragança | Braganza |
| braggart | fanfarrón |
| bragging | fanfarronada |
| Braggio | Braggio |
| Bragi | Bragi |
| Bragi Boddason | Bragi Boddason |
| Braguinha | Braguinha |
| Brahma | Brahmā |
| Brahma Kumaris World Spiritual University | Brahma Kumaris |
| Brahmacharya | Brahmacharya |
| Brahmagupta | Brahmagupta |
| Brahmagupta-Fibonacci identity | Identidad de Brahmagupta |
| Brahman | brahmán |
| Brahmana | Brahmana |
| Brahmani River | Brahmani |
| Brahmanism | Brahmanismo |
| Brahmapootra | Brahmaputra |
| Brahmaputra | Brahmaputra |
| Brahmaputra River | Brahmaputra |
| Brahmin | brahmán |
| Brahminism | Brahmanismo |
| Brahmo Samaj | Brahmo Samaj |
| braid | trenza |
| braids | trenza |
| Braidwood Nuclear Generating Station | Central Nuclear de Braidwood |
| braille | braille |
| brain | luz |
| brain cancer | cáncer del cerebro |
| brain cell | célula cerebral |
| Brain child | Parto del ingenio |
| brain drain | fuga de cerebros |
| brain fever | meningitis |
| Brain in a vat | Cerebro en una cubeta |
| brain mushroom | falsa colmenilla |
| Brain power | Inteligencia |
| brain stem | tronco del encéfalo |
| Brain tablet | Cigarrillo |
| brain trust | grupo de expertos |
| brain wave | idea luminosa |
| Brain-computer interface | Interfaz Cerebro Computadora |
| Brain-Computer-Interface | Interfaz Cerebro Computadora |
| brain-washing | lavado de cerebro |
| Brainbuster | Lucha libre profesional |
| braincase | cráneo |
| brainchild | invención |
| Brainfuck | Brainfuck |
| brainless | insensato |
| brainpan | cráneo |
| brains | genio |
| brainstorm | idea luminosa |
| Brainstorming | Lluvia de ideas |
| brainteaser | acertijo mental |
| brainwash | lavar el cerebro |
| brainwashing | lavado de cerebro |
| brainwork | reflexión |
| brainy | agudo |
| braise | asar |
| braising | cocción a fuego lento |
| brake | freno |
| Brake assist | BAS |
| brake light | luz de freno |
| brake lining | forro del freno |
| brake pad | pastilla de frenos |
| brake shoe | zapata de freno |
| brakedown | averia |
| braking | frenar |
