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| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
| circadian rhythm |
| (suhr-KAY-dee-uhn) An activity cycle lasting twenty-four hours. Many living things, including humans, follow a circadian rhythm. (See biological clock.) | 1 |
| The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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