- coupling sleeve
- coupling unit
- coupon
- courageous
- courbature
- course
- course indicator
- courtesy
- courthouse
- couvade
- covalent bonds
- covariance
- covariance function
- covariant
- cove mold
- cover cap
- cover glass
- cover layer
- cover over
- cover plate
- cover slip
- cover strip
- cover tile
- coverage diagram
- coverage range
- covered cable
- covered conduit
- covered plain
- covering
- covering material
- covering power
- covering theorem
- coving
- coward
- cowling
- coworker
- cowper stove
- cox
- corrugated waveguide
- corrugating machine
- corrugation
- corrugation process
- corrugations
- corrugator
- corruption
- cortex
- cortical neuron
- cortile
- corynebacterium
- cosecant
- cosecant antenna
- cosine curve
- cosine law
- cosine-line
- cosinusoid
- cosmic fog
- cosmic ray
- cosmic shower
- cosmic space
- cosmical
- cosmography
- cosmos
- cost bearer
- cost function
- cost index
- cost indices
- cost reduction
- costa
- cotangent curve
- cotangential orbit
- cotter
- cotter key
- cotter pin
- cotter slot
- cottering
- cotton pad
- cotton wool
- cotylopublo
- couch press
- couch roll
- Couette viscometer
- Coulomb energy
- coulomb force
- coulometer
- coulter
- count
- count field
- countable
- counter
- counter berm
- counter circuit
- counter coupling
- counter curly
- counter flow
- counter nut
- counter reaction
- counter slope
- counter station
- counter voltage
- counter-offend