prot - quan
- protactinium
- protanomalous vision
- protanopia
- protect
- protected
- protecting
- protecting cap
- protecting plasma mantle
- protection
- protection cell
- protection problem
- protection system
- protective
- protective action
- protective case
- protective clothing
- protective coating
- protective device
- protective effect
- protective envelope
- protective facilities
- protective film
- protective glass
- protective ground
- protective grounding
- protective housing
- protective interlock
- protective layer
- protective mask
- protective material
- protective means
- protective measures
- protective medium
- protective packaging
- protective plug
- protective properties
- protective screen
- protective seal
- protective shield
- protective suit