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diurnal

adjective
🔊/daɪˈɜːnl/
🔊/daɪˈɜːrnl/
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  1. (biology生物) (of animals动物) active during the day日间活动的；昼行性的
    • Unlike most other bats, this species is diurnal.这种蝙蝠与大多数蝙蝠不同，是在日间活动的。
    opposite nocturnal
  2. (astronomy天文学) taking one day周日的
    • the diurnal rotation of the earth地球的周日自转
    Topics Timec2
    3. Word Originlate Middle English (as a term in astronomy): from late Latin diurnalis, from Latin diurnus ‘daily’, from dies ‘day’.