- combustion pressure
- combustion residue
- combustion volume
- comedite
- cold mixing
- cold moulding
- cold tar
- colemeanite
- collapse
- collapse caldera
- collapse valley
- collapsible
- collar cap
- collar flange
- collargol
- collect
- collecting main
- collecting pit
- collection basin
- collector plate
- collinear arry
- collite
- collodion
- colloid clay
- colloid mill
- colloidal clay
- colloidal graphite
- colloidal silica
- color metallography
- color reaction
- coloration
- colorimetric
- colour bearing
- colour metallography
- colour standard
- colour test
- coloured
- column
- columnar section
- comb structure
- combination analysis
- color temperature
- color tone
- colored stock
- coloring matter
- colorproof
- colour conditioning
- column drill
- column hoist
- column mounting
- columnar basalt
- columnar crystal
- columnar habitus
- columnar structure
- combination
- combination cracking
- combination gas
- combination process
- combination rig
- combination tower
- combined lime
- combined method
- combined strength
- combined sulfur
- common iron
- common lime
- common mica
- commencement
- commercial efficiency
- commercial field
- commercial quantity
- commercial tank
- commercial wax
- commingle
- comminute
- common salt
- combination principle
- combined action
- combined work
- combining cone
- comburation
- combustible shale
- combustion analysis
- combustion catalyst
- combustion control
- combustion improver
- combustion potential
- combustion process
- combustion recorder
- combustion turbine
- combustion zone
- come of
- come over
- commence
- commercial explosive
- commercial production
- commercial yield
- commodity credit
- common garnet
- compaction trend