- collective kitchen
- collective storeroom
- collector
- collector cover
- collector pipe
- college
- collimation error
- collision
- collude
- coffer
- coffer-dam
- cofferdam
- coffered ceiling
- cogradiently
- coherent rocks
- cohesion
- cohesionless
- cohesive soil
- coil
- coil boiler
- coil holder
- coiled sheet
- coincidence
- coincidence frequency
- coke deposit
- colander
- cold asphalt
- cold bitumization
- cold boot
- cold control
- cold drawing
- cold feed
- cold hardening
- cold lighting
- cold start
- cold store
- cold supply
- cold weather
- cold-bend
- cold-worked
- coldhardening
- collapse load
- collapsible form
- collapsible scaffolds
- collapsible structure
- collar
- collar flashing
- collar tile
- collaring
- collecting busbar
- collecting ditch
- collecting launder
- collecting road
- collective garden
- collector aperture
- collector crossing
- collector drain
- collimation line
- colloidal chemistry
- colloidal grout
- colonial
- colony
- color code
- color concrete
- colloidal setting
- colloids
- colloquial
- colonnade
- colophon
- color
- color display
- color tray
- colorant
- colossal
- colour
- colour photography
- colour rendering
- colour scheme
- colour uniformity
- coloured aggregate
- coloured concrete
- coloured enamel
- coloured glass
- coloured glaze
- coloured pencil
- column charge
- column pile
- column row
- column wide
- comb
- combination cut
- combination lock
- combined activity
- combined bending
- combined drawing
- combined erection
- combined excitation
- combined grinding
- combined illumination
- combined interpretation