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diel

[dahy-uh l, dee-] /ˈdaɪ əl, ˈdi-/
adjective, Biology
1.
of or pertaining to a 24-hour period, especially a regular daily cycle, as of the physiology or behavior of an organism.
Origin
1930-1935
1930-35; apparently < Latin di(ēs) day + -al1, spelling with e to avoid identity with dial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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