球腹蛛科，钳颚亚目(Labiognatha)中一科，包括毒液有时可致人于死的毒蛛属(Latrodectus)- Bjerrum's scotoma(sign)
- Bjerrum's screen
- Bk
- black
- Blackberg and Wanger's test
- black haw
- blackhead
- blackleg
- blackout
- blackquarter
- blacksnake
- blacktongue
- bladder
- Blainville's ear
- Blake's dis ks
- Blalock-Hanlon operation
- Blalock-Taussig operation
- blanc
- Blanchard's method,treatment
- Blancophor
- bland
- Blandin's ganglion,glands
- Blandlube
- blankophore
- Blasius' duct