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  Dictionary Definition of aster

aster
noun
1. Botany any plant of the large genus Aster, family Compositae, having rays varying from white or pink to blue around a yellow disc.
2. a plant of some allied genus, as Stokesia cyanea ( Stoke's aster ).
3. Also, cytaster. Biology either of two star-shaped structures formed in a cell during mitosis.
[L, from Greek: star]