diurnal
adjective /daɪˈɜːnl/
/daɪˈɜːrnl/
- (biology) (of animals) active during the day
- Unlike most other bats, this species is diurnal.
- (astronomy) taking one day
- the diurnal rotation of the earth
Word Originlate Middle English (as a term in astronomy): from late Latin diurnalis, from Latin diurnus ‘daily’, from dies ‘day’.