- chrominance elimination
- chrominance phase
- chrominance subcarrier
- chroming
- chromium steel
- chromometer
- chromoradiometer
- chronocyclegraph
- chronograph
- chronometric radiosonde
- chuck
- chucking
- chunk ice
- church
- churn drill
- chute
- chute spillway
- cinching
- cincture
- cinema studio
- cineritious
- cipher code
- cipher system
- circle
- circle diagram
- circle graduation
- circuit
- circuit diagram
- circuit element
- circuit panel
- circuit switch
- circuit tester
- circuit theory
- circuital
- circuitry
- circulant
- circular
- circular antenna
- circular arch
- circular axis
- circular buffer
- circular fault
- circular function
- circular graph
- circular groove
- circular helicoid
- circular horn
- circular kiln
- circular level
- circular list
- circular permutation
- circular pitch
- circular plate
- circular polarization
- circular railway
- circular ring
- chordoma
- chormation
- chroma
- chroma signal
- chromagate
- chromate
- chromatic aberration
- chromatic flicker
- chromaticity diagram
- chrome
- chrome steel
- chrominance
- chrominance synchronization
- chronometer
- chronometric data
- chronometric tachometer
- chronotron
- chuck block
- chuck hole
- chuck lathe
- chug
- chuk gage
- chur hole
- church porch
- churn
- churn drilling
- churning
- cienagas
- cigar antenna
- cigarette
- cill
- cillum
- cinder
- cinder concrete
- cinder hole
- cinder mound
- cinder-box
- cinematics
- cinetheodolite
- cinque
- cipher
- cipher key
- circle diameter
- circle snips