- convex curve
- convex lens
- convex programming
- conveyance
- conveying trough
- conveyor chain
- convolution
- cooled storehouse
- cooling agent
- cooling coefficient
- cooling effect
- cooling load
- cooling surface
- cooling tower
- cooling zone
- cooperage
- coordinate axes
- coordinate control
- coordinate direction
- coordinate measurement
- coordinate paper
- cordon
- cordon stone
- corduroy road
- core
- core area
- core bit
- core drill
- core extractor
- core housing
- core material
- core moment
- core rail
- core sampling
- core sand
- core saturation
- core test
- core transformer
- core trench
- core wall
- core width
- corinthian
- corinthian order
- cork
- cork board
- cork brick
- cork carpel
- cork tile
- cork wood
- corkboard
- corkscrew stairs
- corkwood
- corn crib
- cornea-calcareous
- corner
- corner band
- corner basin
- corner bead
- corner block
- corner board
- corner brace
- corner bracing
- corner brick
- corner cramp
- corner flat
- corner head
- corner joint
- corner panel
- corner pilaster
- corner plate
- corner reinforcement
- corner slab
- corner spandrel
- corner step
- corner strap
- corner support
- corner tile
- corner weld
- corner window
- corner-stone
- cornerite
- cornerstone
- cornice
- cornice glacier
- cornice outreach
- cornice panel
- cornice slab
- corniced
- coronation
- corpse
- corpuscle
- corral
- corrallite
- correct
- correction monogram
- corrective maintenance
- correlation analysis
- correspondence
- correspondence school
- corridor