- conversion electrons
- convexo-convex
- core diameter
- core matrix
- cork borer
- corner cutting
- corner mounts
- corpuscle
- corpuscular radiation
- corpuscular theory
- corpuscule
- correcting lens
- correcting optics
- correction filter
- correction lens
- corrosion nodule
- corrosion pickling
- cosmic rays
- coulomb attraction
- Coulomb barrier
- coulomb friction
- Coulomb repulsion
- counter mechanism
- coupled rangefinder
- coupled system
- course
- covalence
- cover glass
- cover slip
- cotter pin
- cotton balance
- Couette flow
- counter
- counterpoise
- coupled oscillators
- coupled surge
- coupling
- coupling equation
- cover gas
- cracked
- creep
- creep properties
- creeping motion
- crept
- critical assembly
- critical duration
- critical reactor
- crochet
- cryoscopy
- crosspiece
- crucible fusion
- crucible tongs
- crystal optics
- crystal spectrometer
- curium series
- current element
- crimping tool
- critical
- crossed nicols
- cut film
- cut-off
- cutting stylus
- crush
- cryoscope
- cutout photograph
- cybernetics
- cycle
- cyclic accelerator
- cyclic noise
- cycloidal gear
- cyclotron
- cylinder superheat
- cylindrical coordinates
- cylindrical grinder
- cylindrical irradiator
- D-layer
- dashpot
- daughter product
- decay cavity
- decay heat
- decompose
- decontamination system
- defect
- degradation
- delayed coking
- damp
- damped
- damped pendulum
- damped vibrations
- dark fringe
- datarom
- debounce circuit
- decarbonize
- decay
- decelerated
- deceterate
- decineper
- decolorize
- damper
- damping force