(of animals 动物 active at night 夜行的；夜出的 owls and other nocturnal creatures 猫头鹰和其他夜间生物 These animals are strictly nocturnal. 这些动物是严格夜间活动的。 These insects are largely nocturnal. 这些昆虫大部分是夜间活动的。
- (formal)
happening during the night 夜间发生的 a nocturnal visit 夜访
Word Originlate 15th cent.: from late Latin nocturnalis, from Latin nocturnus ‘of the night’, from nox, noct- ‘night’.