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diel

[ dahy-uhl, dee- ]
/ ˈdaɪ əl, ˈdi- /
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adjective Biology.
of or relating to a 24-hour period, especially a regular daily cycle, as of the physiology or behavior of an organism.
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Origin of diel

1930–35; apparently <Latin di(ēs) day + -al1, spelling with e to avoid identity with dial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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