re·veal 2 
(rĭ-vēl)
(rĭ-vēl)n.
1.
a. The part of the side of a window or door opening that is between the outer surface of a wall and the window or door frame.
b. The whole side of such an opening; the jamb.
2. The framework of a motor vehicle window.
[From Middle English revalen, to lower, from Old French revaler : re-, re- + avaler, to lower (from a val, down : a, to from Latin ad; see AD- + val, valley; see VALE1).]