- visual axis
- visual telephone
- vitiated air
- VMOS transistor
- voice channel
- waste heat
- water absorption
- water adsorption
- water cooling
- water distribution
- water droplet
- water effect
- water entrainment
- water film
- water freezing
- water jacket
- water leak
- water meter
- water precooler
- water resistance
- water rheostat
- water sprayer
- water tank
- water thawing
- water turbine
- water wheel
- VU-meter
- Vuilleumier cycle
- vulcanizer
- wafer slab
- wall battery
- wall box
- wall coil
- wall diffuser
- wall effect
- wall fan
- wall losses
- wall showcase
- warble tone
- warm air
- warming room
- washed air
- water circuit
- water coolant
- water cooler
- water defrosting
- water forecooling
- water gauge
- water hammer
- water load
- water mist
- water power
- water preheater
- water screen
- water spray
- water supply
- water-cooled
- water-soluble
- waterproof insulation
- waterproof paper
- waterproofness
- watertightness
- watt current
- Watt"slaw
- wattage
- wattage rating
- wattful
- wattless component
- wattless power
- Wauchope starter
- wave angle
- wave band
- wave clutter
- wave converter
- wave mechanics
- wave propagation
- wave tilt
- wave train
- wave velocity
- wave winding
- wave-shape
- wavefront
- waveguide assembly
- waveguide bend
- waveguide cavity
- waveguide connector
- waveguide coupler
- waveguide hybrid
- waveguide lens
- waveguide plunger
- waveguide resonator
- waveguide slot
- waveguide switch
- waveguide window
- wavelet
- waviness
- wax precipitation
- wayleave
- weak boson
- weak gas