Source : Webster's Revised Unabridged Dictionary (1913)

Blastostyle \Blas"to*style\, n. [Gr. blasto`s sprout, bud + ? a
   pillar.] (Zo["o]l.)
   In certain hydroids, an imperfect zooid, whose special
   function is to produce medusoid buds. See {Hydroidea}, and
   {Athecata}.