diel

adjective
di·​el | \ˈdī-əl, -ˌel\

Definition of diel 

: involving a 24-hour period that usually includes a day and the adjoining night diel fluctuations in temperature

First Known Use of diel

1934, in the meaning defined above

History and Etymology for diel

irregular from Latin dies day + English -al

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The first known use of diel was in 1934

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