- coprecipitation
- coprocessor
- copy
- copy buffer
- copy desk
- copy disk
- copy paper
- copy picture
- copyediting
- copying
- copying device
- copying document
- copying graphic
- copying paper
- copying text
- coral
- coral limestone
- coral reef
- corbel
- corbel course
- corbel piece
- corbelling
- cord
- cord suspension
- cord-less
- cordage fibre
- corded way
- continuous mixer
- continuous operation
- continuous polisher
- continuous production
- continuous purlin
- continuous sheeting
- continuous span
- continuous string
- continuous strip
- continuous traffic
- continuous turfing
- continuous variability
- continuous wave
- continuum system
- contour
- contour interval
- contract bond
- contract tariff
- contraction
- contrast image
- contributing editor
- control
- control box
- control bus
- control flume
- control gate
- control handle
- control joint
- control operator
- control point
- control roller
- control testing
- control tower
- controlling event
- convector connection
- convention
- conventional
- conventional bridge
- conventional stress
- converging jetties
- converter
- convex bank
- convex road
- convex weld
- conveyor operator
- convoy
- cooling air
- cooling shaft
- contraction joint
- contractor
- contrariwise
- contribute
- control action
- control cabinet
- control code
- control gird
- control injection
- control key
- control object
- control palette
- control pile
- control register
- control structure
- controlled stress
- controlled ventilation
- controller
- controlling computer
- convergence
- converging forces
- converse
- convertible hall
- convertible stand
- converting substation