/ves"peuhr tin, -tuyn'/ , adj.
1. of, pertaining to, or occurring in the evening: vespertine stillness.
2. Bot. opening or expanding in the evening, as certain flowers.
3. Zool. appearing or flying in the early evening; crepuscular.
Also, vespertinal /ves'peuhr tuyn"l/ .
[ 1495-1505; vespertinus, equiv. to vesper VESPER + -tinus adj. suffix ]