circadian
[sur-key-dee-uh n, -kad-ee-, sur-kuh-dee-uh n]
adjective
noting or pertaining to rhythmic biological cycles recurring at approximately 24-hour intervals.
RELATED WORDS
regularly, often, periodic, constantly, regular, routine, everyday, day-to-day, ordinary, commonplace, common, quotidian, cyclic, diurnal
Nearby words
- ciprofloxacin,
- cir.,
- circ,
- circ.,
- circa,
- circadian rhythm,
- circaean,
- circannual,
- circassia,
- circassian
Origin of circadian
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for circadian
Bright light is what keeps our circadian rhythms in good order.
Lighting signals your body's circadian rhythm and can have a strong effect on your mood.
“One of the most important things you can do for your sleep is to have a routine to keep your circadian rhythm normal,” says Suh.
circadian
adjective
Word Origin for circadian
C20: from Latin circa about + diēs day
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
circadian
coined 1959 from Latin circa "about" (see circa) + diem, accusative singular of dies "day" (see diurnal). The original use is in circadian rhythm.
Online Etymology Dictionary, © 2010 Douglas Harper
circadian
[sər-kā′dē-ən, -kăd′ē-, sûr′kə-dī′ən, -dē′-]
adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.