As″ter (ăs″tẽr), n. [L. aster aster, star, Gr. αστἤρ star. See Star.] 1. (Bot.) A genus of herbs with compound white or bluish flowers; starwort; Michaelmas daisy.
2. (Floriculture) A plant of the genus Callistephus. Many varieties (called China asters, German asters, etc.) are cultivated for their handsome compound flowers.