Source : Webster's Revised Unabridged Dictionary (1913)

Amphiaster \Am"phi*as`ter\, n. [NL., fr. Gr. 'amfi` + 'asth`r a
   star.] (Biol.)
   The achromatic figure, formed in mitotic cell-division,
   consisting of two asters connected by a spindle-shaped bundle
   of rodlike fibers diverging from each aster, and called the
   spindle.