nocturnal

Từ điển Oxford Advanced Learner 8th

noc·tur·nal BrE [nɒkˈtɜːnl] NAmE [nɑːkˈtɜːrnl] adjective
1. (of animals)active at night
Opp: ↑diurnal
2. (formal)happening during the night
•a nocturnal visit

Word Origin:
[nocturnal] late 15th cent.: from late Latin nocturnalis, from Latin nocturnus ‘of the night’, from nox, noct- ‘night’.

Example Bank:
•These animals are strictly nocturnal.
•These insects are largely nocturnal.