- clear distance
- clear finish
- clear glass
- clear headway
- clear length
- clear-obscure
- clearance
- clearance height
- clearing work
- cleat
- cleat hook
- cleavage
- cleavage plane
- cleaver
- cleaving saw
- clerestory roof
- clerestory window
- clerical work
- clevice bolt
- clevis
- client area
- client system
- climathrone
- climatic condition
- clamahell excavator
- clamp
- clamp terminal
- clamshell
- clamshell excavator
- clarification
- clarification tank
- clasp joint
- clasping buttress
- classical
- classification siding
- classified road
- clastic constant
- clastic fatigue
- clastic packing
- clay
- clay bank
- clay fraction
- clay grinder
- clay injection
- clay limestone
- clay mud
- clay pit
- clay quarry
- clay sand
- clay shingle
- clay slurry
- clay stratum
- clay works
- clean timber
- cleanout pipe
- clear glaze
- clear out
- clear space
- clear varnish
- clearance gauge
- clearing
- clearing operations
- clearing rake
- cleaving
- cleaving grader
- cleaving timber
- clerestory
- clever
- click
- client
- client application
- cliff glacier
- cliff house
- climatic effect
- climatic factor
- climatic regime
- climatic region
- climatography
- climb up
- climbing formwork
- clinch bolt
- clincher
- clinical laboratory
- clinker cooler
- clinker cooling
- clinker output
- clinker pavement
- clinker ring
- clinkering zone
- clip
- clipping
- cloakroom
- cloakroom furniture
- clock register
- cloister
- cloister vault
- close all
- closure
- closure dam
- closure embankment