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2 definitions found
 for Aster
From The Collaborative International Dictionary of English v.0.48 :

  Aster \As"ter\ ([a^]s"t[~e]r), n. [L. aster aster, star, Gr.
     'asth`r star. See Star.]
     1. (Bot.) A genus of herbs with compound white or bluish
        flowers; starwort; Michaelmas daisy.
        [1913 Webster]
  
     2. (Floriculture) A plant of the genus Callistephus. Many
        varieties (called China asters, German asters, etc.)
        are cultivated for their handsome compound flowers.
        [1913 Webster]
  
     3. (Biol.) A star-shaped figure of achromatic substance found
        chiefly in cells dividing by mitosis.
        [Webster 1913 Suppl.]

From WordNet (r) 3.0 (2006) :

  aster
      n 1: any of various chiefly fall-blooming herbs of the genus
           Aster with showy daisylike flowers
      2: star-shaped structure formed in the cytoplasm of a cell
         having fibers like rays that surround the centrosome during
         mitosis

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