C-H activation

C. difficile outbreaks in the mid-2000s

Cabbage

Cable television system

Cable testing (electricity)

Cable-stayed bridge

Cacao

Cachexia

Cactus

Cadmium

Cadmium metallurgy

Caenogastropoda

Caffeine

Cage hydrocarbon

Caisson foundation

Calamine

Calanoida

Calcarea

Calcichordates

Calcite

Calcitonin

Calcium

Calcium metabolism

Calculator

Calculus

Calculus of variations

Calculus of vectors

Caldera

Caldwell catalog

Calendar

Calibration

Caliche

Californium

Caliper

Callitrichales

Calobryales

Calomel

Calorimetry

Calycerales

Cam mechanism

Cambrian

Camel

Camel's hair

Cameo

Camerata

Campanulales

Camphor

Camphor tree

Camptostromatoidea

Canal

Cancer

Cancer (constellation)

Cancer cell metabolism

Cancer gene therapy

Cancer stem cell

Cancer treatment using magnetic nanoparticles

Cancer, immunotherapy, and mouse avatars

Cancrinite

Candida

Candlepower

CANDU reactor

Canine distemper

Canine influenza

Canine parvovirus infection

Canis Major

Cannon's conjecture

Canonical coordinates and transformations

Cantaloupe

Cantilever

Capabilities-based planning

Capability maturity modeling

Capacitance

Capacitance measurement

Capacitance multiplication

Capacitance tomography

Capillary electrochromatography

Capillary electrophoresis-SELEX

Capparales

Capricornus

Caprimulgiformes

Capsule robots for endoscopy

Captorhinida

Carat

Caraway

Carbohydrate

Carbohydrate metabolism

Carbon

Carbon black

Carbon capture and storage

Carbon dioxide

Carbon MEMS

Carbon monoxide

Carbon nanotube responsive materials and applications

Carbon nanotubes

Carbon sequestration

Carbon star

Carbon-based electronics

Carbon-nitrogen-oxygen cycles (astrophysics)

Carbonate mineral

Carbonate sedimentology