- clay tile
- clay wetting
- clayed
- clayey
- clayey rock
- clayish
- clayness
- cleaned
- cleaned coal
- cleaned gas
- cleaning
- cleaning blower
- cleaning cleaner
- cleaning door
- cleaning eye
- cleaning machine
- cleanliness
- cleans
- cleanser
- cleansing compound
- cleanup
- clear air
- clear away
- clear channel
- clear headway
- clear ice
- clear lumber
- clear spacing
- clear storage
- clear timber
- clear vision
- clear well
- clear wood
- clear-way
- clearance
- clearance angle
- clearance height
- clearance loss
- clearing gallery
- clearing instruction
- clearness
- cleat
- cleat hook
- cleavage
- cleavage angle
- cleavage plane
- cleavage test
- cleaving machine
- cleft welding
- clevis
- clichwork
- click track
- client area
- cliff
- cliffed
- climatic chamber
- climatic condition
- climatic hazard
- clamp
- clamp hose
- clamp terminal
- clamped capacitance
- clamping band
- clamping collar
- clamping fixture
- clamping pressure
- clamshell
- clapper
- clarification
- clarification tank
- clarifier basin
- clarifying
- Clark cell
- clash
- clasp
- clasp joint
- class boundary
- class condition
- class lock
- class method
- classic logic
- classification siding
- classification track
- classifier classification
- classifying
- classifying map
- clastic constant
- clastic sediment
- Clausius inequality
- claw chuck
- claw-hammer
- clay
- clay crucible
- clay mill
- clay mud
- clay parting
- clay sand
- clay shingle
- clay ware
- clayey soil