Letter D

Diurnal

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Occurring in the daytime.

A patient may have a diurnal fever rather than a nocturnal one.

Diurnal also can refer to recurring every day.

Pronounced die-URN-ul, it comes from the Latin 'dies' for day, the root of many words including circadian (about a day, about 24 hours), quotidian (which also means recurring every day), journal, etc

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