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

Ab'diel, the faithful seraph who withstood Satan when he urged those under him to revolt.
Character Sketches of Romance, Fiction and the Drama, Vol 1|The Rev. E. Cobham Brewer, LL.D.
The Marmalade Pippin of Diel which is described in the 22 vol.
British Pomology|Robert Hogg
Origin unknown; Diel states he had received it from Strasland, Prussia.
The Pears of New York|U. P. Hedrick
Diel, first to describe it, placed its origin at about 1806.
The Pears of New York|U. P. Hedrick

According to Diel this variety originated in the environs of Halle, Prussia.
The Pears of New York|U. P. Hedrick