What is of or pertaining to the evening, or to the service of vespers; as, a vesper hymn; vesper bells. Vesper sparrow, the grass finch. See under Grass called?

vesper — Of or pertaining to the evening, or to the service of vespers; as, a vesper hymn; vesper bells. Vesper sparrow, the grass finch. See under Grass. (Webster's 1913.)