tritagonist: Meaning and Definition of

tri•tag•o•nist

Pronunciation: (tri-tag'u-nist), [key]
— n.
  1. (in ancient Greece) the third member of an acting troupe, which always consisted of three actors. Cf.(def. 4),
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.