颚蛭科：蛭纲(Hirudinea)的一科，包括多属水蛭，有蛭属(Hi-rudo)、软水蛭属(Limnatis)、山蛭属(Haemadipsa)、巨蛭属(Macrobdella)、兽蛭属(Theromyzon)、黄蛭属(Haemopis)、恐蛭属(Dinobdella)和水蛭属(Hirudinaria)- bradyuria
- bradyzoite
- braidism
- Braid's strabismus
- Brailey's operation
- braille
- brain
- Brain's reflex
- brain stem
- brake
- bran
- branch
- branched-chain 2-keto acid dehydrogenase
- branched-chain aminoacid transaminas
- branched-chain α-keto acid decarboxylase
- brancher deficiency
- brancher enzyme, branching enzyme
- branchia
- branchial
- branching enzyme
- branchiogenic
- branchiogenous
- branchioma
- branchiomere
- branchiomeric