First Known Use: 14th century
Dictionary
1diurnal
adjective di·ur·nal \dī-ˈər-nəl\
: active mainly during the day
: happening every day
Full Definition of DIURNAL
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 \-nəl-ē\ adverb
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Origin of DIURNAL
Middle English, from Latin diurnalis — more at journal
Related to DIURNAL
- Synonyms
- day-to-day, daily, quotidian
Other Botany Terms
2diurnal
noun
Medical Dictionary
diurnal
adjective di·ur·nal \dī-ˈərn-əl\
Medical Definition of DIURNAL
1
: having a daily cycle <diurnal rhythms>
2
a : of, relating to, or occurring in the daytime <diurnal activity> b : chiefly active during the daytime <diurnal mosquitoes>
—di·ur·nal·ly \-əl-ē\ adverb
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