- wood peat
- wool wax
- work life
- worked penetration
- working hypothesis
- working life
- working oil
- working substance
- working tank
- working volume
- workover
- worm gear
- worm wheel
- wrapped
- wrapped bushing
- wrapped pipe
- wrapper
- wrapping machine
- wreck buoy
- wrinkle paint
- wrinkled
- wrong connection
- wrought iron
- wrought washer
- wulfenite
- Wulff process
- Wurman stage
- xanthic
- xanthogenic
- xanthophyll
- xenocryst
- xenomorphic structure
- xenomorphic texture
- xenon
- xylanthtite
- xylenes
- xylenol
- xylidine
- xylonite
- xylopal
- xyloretinite
- xylose
- xylotile
- YAG
- yank
- yard
- yard stick
- Yarmouthian stage
- yearbook
- yearly capacity
- yearly output
- yellow litharge
- yellow spinel
- yellow wax
- yellowish
- yentnite
- yieldable arch
- yielding coupling
- ylem
- Yorkshire grease
- Ypresian stage
- yttrium oxide
- Z-bar
- z-iron
- zwitterion
- zymotic
- Zechstein
- zees
- zenith
- zeolite process
- zeolitic
- zero adjustment
- zero alignment
- zero bias
- zero creep
- zero instrument
- zero level
- zero line
- zero load
- zero mark
- zero method
- zero setting
- zero shift
- zero valence
- Ziegler process
- zigger
- zinc chrome
- zinc coating
- zinc covering
- zinc dust
- zinc furnace
- zinc oxide
- zinc spinel
- zinc sponge
- zinc sulphide
- zinnober
- zirconia
- zirconic
- zirconium hydride
- zirconyl