vespertine \VES-per-tin\ , adjective;
1. Of, pertaining to, or occurring in the evening.
2. Botany. Opening or expanding in the evening, as certain flowers.
3. Zoology. Becoming active in the evening, as bats and owls.
To my own ear, I sound hyperpoetic, and I don’t mean to exaggerate these vespertine moods; I think that this restlessness that I am describing was really quite ordinary.
— Peter Gadol, The Long Rain
Vespertine derives from Latin vespertīnus, “evening.”