WAbsinthe
WAluminium foil
WArgand lamp
WAtomic force microscopy
WBank secrecy
WBasic oxygen steelmaking
WBathyscaphe
WCellophane
WDye-sensitized solar cell
WEidophor
WGrasshopper escapement
WHang (instrument)
WHook-and-loop fastener
WHygrometer
WJigsaw (tool)
WLaudanum
WLysergic acid diethylamide
WMuesli
WPhotochrom
WPlanar process
WScanning tunneling microscope
WSmaky
WSuper-twisted nematic display
WSwatch Internet Time
WSwiss Army knife
WSwiss-suited playing cards
WTourbillon
WTrieste (bathyscaphe)
WTwisted nematic field effect
WWhite chocolate