- classifying apparatus
- classifying equipment
- classifying screen
- classmate
- classtate
- clastic deformation
- clastic energy
- clastic limit
- clastic recoil
- clastic rock
- clastic support
- clastogene
- Clausius law
- Clausius theorem
- claw bar
- claw collecting
- clay bed
- clay bit
- clay concrete
- clay content
- clay cutter
- clay excavator
- clay furnace
- clay grout
- clay industry
- clay intercalation
- clay layer
- clay loam
- clay mass
- clay mineral
- clay mortar
- clay part
- clay pipe
- clay rock
- clay schist
- clay shale
- clay slate
- clay soil
- clay suspension
- clay wall
- clayed ground
- clayed soil
- clayey limestone
- claying bar
- claystone
- clean
- clean air
- clean coal
- clean copy
- clean disk
- clean energy
- clean gas
- clean oil
- clean proof
- clean rain
- clean room
- cleaner
- cleaning disk
- cleanout
- cleanse
- clear
- clear height
- clear memory
- clear pond
- clear span
- clear water
- clear zone
- chloride glass
- chloring
- chock
- chock block
- choice
- choice reaction
- choke
- choke dike
- choke piston
- choke valve
- choker
- choking
- choose
- chopper
- chopping
- choppy
- choppy sea
- chord
- chord stress
- chorometry
- chroma band
- chroma delay
- chroma flutter
- chroma pilot
- chromatic
- chromatic balance
- chromatic number
- chromatic splitting
- chromaticity
- chromaticity coordinates
- chromatron
- chrome green
- chrominance carrier