- chemical pump
- chemical reactor
- chemical rock
- chemical similitude
- chemical structure
- chemical symbol
- chemical waste
- chemically
- chemically neutral
- chemiosynthesis
- chemism
- chemotaxis
- chemurgy
- chengal
- cherry coal
- chert
- chestnut coal
- chile salpetre
- chillagite
- chilled
- chilled margin
- chiller
- chilling machine
- chilling plate
- chilling point
- chimney draught
- chimney rock
- china clay
- Chinese wax
- chinopinacoid
- chipboard
- chitosamin
- chloral
- chlorophane
- chloroprene
- chlotrilene
- cholesteric material
- chrome tanning
- chromium
- chromogen
- chromotropic
- chrysoidine
- chrysoprase
- cibanone
- cinchona
- cineole
- cineration
- cinnabar
- cinnamon
- cinnamyl
- circulating pump
- circumferential joint
- cirque
- cirque glacier
- cirque stairway
- CIS
- citrine
- citron oil
- citronella oil
- citrulline
- claim license
- Claisen flask
- clamp bolt
- clamp screw
- clamshell bucket
- clapboard
- clarain
- clarified
- clarified oil
- clarity
- Clark process
- clasolite
- claudetite
- Claus method
- clausthalite
- claw-clutch
- clay activation
- clay cone
- clay decolorising
- clay filter
- clay gouge
- clay loam
- clay percolating
- clay recovery
- clay regeneration
- clay wash
- claying bar
- clean coal
- clean fracture
- cleaning solution
- cleansing oil
- clear gasoline
- chloraphyllite
- chlorate
- chlorex process
- chloride oxide
- chloridize
- chlorinated
- chlorinated hydrocarbon
- chlorinated rubber