Arctic Circle 
The parallel of latitude 66° 33ʹ north of the equator. It marks the northernmost point at which the sun is visible at the northern winter solstice and the southernmost point at which the midnight sun can be seen at the northern summer solstice.
- carcinoid syndrome
- carcinological
- carcinologist
- carcinology
- carcinoma
- carcinoma in situ
- carcinomatosis
- carcinomatous
- carcinosis
- car club
- car coat
- car crash
- car crime
- car culture
- card
- Card.
- cardamom
- Cardamom Mountains
- cardamon
- cardan joint
- cardan shaft
- cardboard
- cardboard city
- card-carrying
- card counter