Meaning of muntin

mun•tin

Pronunciation: (mun'tn), [key]
— n.
  1. Also calleda bar for holding the edges of window panes within a sash. See diag. under
  2. (formerly) a vertical bar in a window sash.
  3. a stile within the frame of a door or the like.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.