adj. Biology
Relating to or exhibiting approximately 24-hour periodicity.
[Latin circā, around; see circa + Latin diēs, day.]
circadianly cir·ca'di·an·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
