American Heritage® Dictionary of the English Language, Fourth
Edition - adj. Of, relating to, or occurring in the evening. -
adj. Botany Opening or blooming in the evening. - adj. Zoology
Becoming active in the evening, as bats and owls; crepuscular.
Century Dictionary and Cyclopedia - In astrology, setting after
the sun: said of a planet. - Of or pertaining to the evening;
happening or being in the evening. - In botany, opening in the
evening, as a flower. - [capitalized] In geology, noting one of
Prof. H. D. Rogers's divisions of the Paleozoic series in
Pennsylvania. It corresponds to No. X. of the numbered series of
thePennsylvania Survey, and includes the Pocono sandstone and
Conglomerate, forming the base of the Carboniferous, and lying
immediately beneath the Mauch Chunk Red Shale (the “Umbral” of
Rogers's nomenclature). See Pocono sandstone, under sandstone. -
In zoology, crepuscular; flying or otherwise specially active in
the twilight of evening, as an insect, a bat, or a bird: as, the
vespertine or