diurnal
/daɪˈɜːnəl/adjective
1
- of or during the day白天的; 日间的。
1.1
- Zoology (of animals) active in the daytime【动】（动物）日间活动的, 昼行性的。
1.2
- Botany (of flowers) open only during the day【植】（花）昼开夜闭的。
2
- daily; of each day每日的; 每天的：
diurnal rhythms.
每天的节奏。
2.1
- Astronomy of or resulting from the daily rotation of the earth【天文】周日的：
diurnal aberration.
周日光行差。
派生词
diurnally
adverb词源
late Middle English (as a term in astronomy)： from late Latin diurnalis, from Latin diurnus 'daily'， from dies 'day'.