Main frame: a unit which  includes the head, sill, and jambs of a window.

Meeting rail: the horizontal rail of a sash that meets the opposing rail of the mating sash when the window is closed.

Mil: One thousandth of an inch (0.0254 millimeter).

Mesh: woven plastic or metal material used to make screens.

Metal-clad windows: wooden windows with a covering of pre-painted aluminum or steel on the exterior surfaces to protect the wood parts from the weather.

Mullion: vertical or horizontal member separating two window units.

Muntin: narrow strip of wood or other material that holds individual glass panes.

Muntin grille: a one-piece grille attached to a window to make a large glass appear as multiple smaller panes.

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