Definition of Diurnal

Diurnal: 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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