反向散射：在放射学中，放射被扩散过程偏转，与放射光束的原有方向成大于90度的角度。另见ray项下的scatter ray- Wetzel's grid
- Wetzel's test
- Weyl's test
- Wharton's duct,jelly (gelatin)
- wheal
- wheat
- wheel
- wheeze
- whelp
- whey
- whiplash
- Whipple's disase,tests
- Whipple's operation,triad
- whipworm
- whisper
- white
- White
- whitecomb
- whitehead
- Whitehead's operation
- whiteleg
- whitepox
- White's operation
- Whitfield's ointment
- whitlow