- vortex train
- wedge densitometer
- wehnelt cylinder
- weigh down
- weighing boat
- weighing dish
- weight
- weight fraction
- weiss domain
- weld region
- welding arc
- welding cinder
- welding compound
- welding defect
- welding nozzle
- weldment
- whole tone
- welding tip
- westcott model
- wire chamber
- work
- whirling
- whole-body
- wide mouth
- wideband beams
- Wien law
- wind channel
- wet nanotechnology
- white light
- Wigner effect
- word wrap
- work standard
- working life
- working mechanism
- writable disk
- wrought
- X-emitter
- X-laser
- X-motor
- X-radiation
- x-rays
- xenon effect
- xenon peak
- xenon reactivity
- xenonthermal
- xerography
- xeroradiography
- xi particle
- Y-piece
- yaw
- yielding seat
- yrast radiation
- yukawa potential
- yukawa well
- z-boson
- Z-coordinate
- zapon foil
- zapon lacquer
- zeeman component
- zenith
- zero
- zero adjustment
- zero band
- zircaloy
- zirconium sponge
- zoom lens
- zoom picture