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circadian

[sur-key-dee-uh n, -kad-ee-, sur-kuh-dee-uh n] /sɜrˈkeɪ di ən, -ˈkæd i-, ˌsɜr kəˈdi ən/
adjective
1.
noting or pertaining to rhythmic biological cycles recurring at approximately 24-hour intervals.
Origin of circadian
1955-1960
1955-60; < Latin circā about + di(ēs) day + -an
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for circadian

circadian

/sɜːˈkeɪdɪən/
adjective
1.
of or relating to biological processes that occur regularly at about 24-hour intervals, even in the absence of periodicity in the environment See also biological clock
Word Origin
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
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Word Origin and History for circadian
adj.

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
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circadian in Medicine

circadian cir·ca·di·an (sər-kā'dē-ən, -kād'ē-, sûr'kə-dī'ən, -dē'-)
adj.
Relating to biological variations or rhythms with a cycle of about 24 hours.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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