What is "parting strip"

Parting \Par"ting\ (p[aum]rt"[i^]ng), a. [From Part, v.]

1. Serving to part; dividing; separating.

2. Given when departing; as, a parting shot; a parting salute. ``Give him that parting kiss.''
   --Shak.

3. Departing. ``Speed the parting guest.''
   --Pope.

4. Admitting of being parted; partible.

   Parting fellow, a partner. [Obs.]
   --Chaucer.

   Parting pulley. See under Pulley.

   Parting sand (Founding), dry, nonadhesive sand, sprinkled upon the partings of a mold to facilitate the separation.

   Parting strip (Arch.), in a sash window, one of the thin strips of wood let into the pulley stile to keep the sashes apart; also, the thin piece inserted in the window box to separate the weights.

   Parting tool (Mach.), a thin tool, used in turning or planing, for cutting a piece in two.