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cinerin
cingulum
cinnabar
cinnabar moth
cinnamic acid
cinnamon
cinnamon bear
cinnamon fern
cinnamon stone
cinque
Cinque Ports
cinquecento
cinquefoil
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cioppino
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circadian
cir·ca·di·an [ sər káydee ən ]


adjective 
Definition:
 
relating to 24-hour cycle: describes a pattern repeated approximately every 24 hours
[Mid-20th century. < Latin circa "about" + dies "day"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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