Etymology
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aster (n.)

flower genus, 1706, from Latin aster "star," from Greek aster (from PIE root *ster- (2) "star"); so called for the radiate heads of the flowers. Originally used in English in the Latin sense (c. 1600) but this is obsolete.

updated on April 24, 2017

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Definitions of aster from WordNet

aster (n.)
any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers;
aster (n.)
star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.