- catastrophe theory
- catastrophic error
- catastrophic failure
- catch basin
- catch drain
- catch fire
- catch plate
- catcher
- catcher-feeder
- catching
- catching groove
- catchline
- catchment geology
- catchpot
- catchwork irrigation
- categorical
- categorization
- categorize
- catenarian curve
- catenary
- catenary line
- catenary suspension
- catenate
- caterer
- caterer problem
- caterpillar
- caterpillar excavator
- caterpillar traction
- caterpillar tractor
- cathead
- cathedral
- cathode
- cathode sputtering
- cathodic screen
- cathodophosphorescence
- cation exchanger
- catwalk
- Cauchy coefficient
- caught
- cauldron
- caulk weld
- caulked seam
- caulker
- causality principle
- cause
- causeway
- caustic embrittlement
- caustic lime
- caustic lye
- caustic wash
- caustic water
- cautery knife
- cavalier microphone
- caved ground
- cavern
- caving
- cavitating
- cavitation
- cavity
- cavity circuit
- cavity oscillator
- cavity pocket
- cavity reactor
- cay
- CB radio
- CCD camera
- CD-ROM
- cease
- cecal appendix
- cedar
- ceiling
- ceiling grid
- catalyst stream
- catalytic process
- catamaran
- cataphoresis
- catastrophe
- catastrophic discharge
- catastrophic flood
- catch
- catch button
- catch pin
- catch pit
- catch spring
- catch tank
- catch-all
- catch-waters
- catcher gap
- catcher resonator
- catching diode
- catchment
- catchment area
- catchment yield
- catchpit
- catchwater-drain
- categories
- categorizing
- category
- catena
- catenary curve