Copulatory organ

Coquina

Coraciiformes

Coral bleaching

Coral diseases

Coral expansion due to photosymbiosis

Coral reef structural complexity

Corallimorpharia

Corallinales

Corbino disk

Cordaitales

Cordierite

Cordilleran belt

Core loss

Coriander

Coriolis acceleration

Corn

Cornales

Corner reflector antenna

Corona discharge

Coronagraph

Coronatae

Coronavirus

Coronoidea

Correlation (physics)

Correspondence principle

Corrosion

Corrosion protection

Cortex (plant)

Cortical gray matter changes in childhood-onset schizophrenia

Cosmic abundance of elements

Cosmic acceleration and galaxy cluster growth

Cosmic background radiation

Cosmic background radiation from the Planck spacecraft

Cosmic distance scale

Cosmic ray

Cosmic spherules

Cosmic strings

Cosmochemistry

Cosmogenic nuclide

Cosmological constant

Cosmology

Cotton

Cotton effect

Cougar

Coulomb excitation

Coulomb explosion

Coulomb's law

Coulometer

Countercurrent exchange (biology)

Countercurrent transfer operations

Couple

Coupled circuits

Coupling

Cover crop

Cowpea

Coxsackievirus

CP symmetry and its violation

CPT theorem

Crab Nebula

Crabapple

Cracking

Cranberry

Cranial nerve

Craniiformea

Crank

Craton

Creep (materials)

Creeping flow

Creodonta

Cress

Cretaceous

Cretaceous bird radiation

Crinoidea

CRISPR genome-editing methods against superbugs

CRISPR-based immunity in prokaryotes

CRISPR/Cas9 gene editing

Critical care medicine

Critical mass

Critical phenomena

Crocodile

Crocodylia

Crocoite

Crossing-over (genetics)

Crossmatching

Crosstalk

Crown gall

"Cruise ship" virus

Cruise ships

Crushing and pulverizing

Crustacea

Crux

Cryobiology

Cryogenics

Cryolite

Cryosphere and climate

Cryotron

Cryptobiosis

Cryptochrome

Cryptocurrency