Source : Webster's Revised Unabridged Dictionary (1913)

Ostracize \Os"tra*cize\, v. t. [imp. & p. p. {Ostracized}; p.
   pr. & vb. n. {Ostracizing}.] [Gr. ?, fr. ? a tile, a tablet
   used in voting, a shell; cf. ? oyster, ? bone. Cf. {Osseous},
   {Oyster}.]
   1. (Gr. Antiq.) To exile by ostracism; to banish by a popular
      vote, as at Athens. --Grote.

   2. To banish from society; to put under the ban; to cast out
      from social, political, or private favor; as, he was
      ostracized by his former friends. --Marvell.