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Definition of: aster
Our photo definition of aster 
(as′tər) noun
1. Any of a large genus (Aster) of plants of the composite family, having alternate leaves, and flowers with white, purple, or blue rays and yellow disk.
2. One of various allied plants, as the China aster.
3. Biol. The starshaped figure appearing in the cytoplasm of a cell during mitosis and associated with the centrosome and spindle fibers. See OVUM. [<L <Gk. astēr star]
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