As·ter n.
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.
3. Biol. A star-shaped figure of achromatic substance found chiefly in cells dividing by mitosis.
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