adj.
Pronunciation: d ī - ' ə r-n ə l
Function: adjective
Etymology: Middle English, from Latin diurnalis ― more at JOURNAL
Date: 14th century
1 a : recurring every day < diurnal tasks> b : having a daily cycle < diurnal tides>
2 a : of, relating to, or occurring in the daytime <the city's diurnal noises> b : active chiefly in the daytime < diurnal animals> c : opening during the day and closing at night < diurnal flowers>
– di · ur · nal · ly \ -n ə l- ē \ adverb