GNU Collaborative International Dictionary of English

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1.       
   Diaster (?), n. [Gr. δι- = δίσ- twice +  star.] (Biol.) A double star; -- applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis.
   
   [1913 Webster]