- critical pressure
- critical reaction
- critical speed
- critical stress
- critical time
- critical velocity
- crochet hook
- crocodile squeezer
- crook
- Crookes tube
- crop
- crop end
- cropping
- cropping shear
- cross adit
- Cruie constant
- crumpled
- crunch
- crush zone
- crushed
- crushed concrete
- crusher roll
- crushing equipment
- crushing power
- crushing strength
- crust freezing
- crustacea
- crusted
- cryo-ophthalmology
- cryocooling
- cryogen
- cryogenic apparatus
- cryogenic cooling
- cryogenic electronics
- cryogenic fluid
- cryogenic operation
- cryogenic refrigeration
- cryogenic substance
- cryogenic technique
- cryolite glass
- cryometer
- cryopump
- cryoretinopexy
- cryoscopy
- cryostat
- cryotherapy
- cryptographic system
- crystal
- crystal axis
- crystal face
- crystal glass
- crystal lattice
- crystal oscillator
- crystal rock
- crystalline crystal
- crystalline schist
- crystalline system
- crystallization center
- crystallization point
- crystallize
- crystallizing dish
- crooked
- crookedness
- crooking
- cross assembler
- cross bed
- cross bevel
- cross bond
- cross compiler
- cross connection
- cross current
- cross direction
- cross drain
- cross fault
- cross feed
- cross fitting
- cross fold
- cross folding
- cross girder
- cross girth
- cross hair
- cross hole
- cross joint
- cross key
- cross link
- cross member
- cross product
- cross rail
- cross slide
- cross tie
- cross traverse
- cross vent
- cross-breed
- cross-connect
- cross-cut
- cross-head
- cross-legged
- cross-over
- cross-thread
- cross-walk