| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| SYLLABICATION: | cir·ca·di·an |
| PRONUNCIATION: |  s r-k  d -n, -k d-, sûr k-d n, -d- |
| ADJECTIVE: | Biology Relating to or exhibiting approximately 24-hour periodicity. | | ETYMOLOGY: | Latin circ, around; see circa + Latin dis, day; see dyeu- in Appendix I. | | OTHER FORMS: | cir·cadi·an·ly —ADVERB
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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