川蜷螺属：以前指较小的淡水的带盖螺，目前归类于川蜷螺科(Melaniidae Thiaridae)的一些属- wart
- Wartenberg's disease
- wash
- wasp
- wasserhelle
- Wassermann-fast
- Wassermann test (reaction)
- waste
- water
- water-borne
- water brash
- Waterhouse-Friderichsen syndrome
- watermelon
- waters
- watershed
- Watkins' operation
- Watson,
- Watson-Crick helix
- Watsonius watsoni
- Watson-Schwartz test
- watt
- wattage
- watt-hour
- wattmeter
- wave