mantel: The shelf above a fireplace, also used in referring to the decorative trim around a fireplace opening.

masonry: Stone, brick, concrete, hollow-tile, concrete-block, gypsum-block, or other similar building units or materials or a combination of the same, bonded together with mortar to form a wall, pier, buttress or similar mass.

metal wall ties: Strips of corrugated metal used to tie a brick veneer wall to a framework.

millwork: Lumber that is shaped to a given pattern or molded form. It includes dressing, matching, and machining. Examples include casing, base, panel door parts, and stair rails.

moisture barrier: A material such as specially treated paper that retards the passage of vapor or moisture into walls, and prevents condensation with the walls.

mortar: A mixture of cement, sand and water, used by the mason as a bonding agent for bricks and stone.

mortise: A slot cut into a board, plank or timber, usually edgewise, to receive the tenon of another board, plank or timber to form a joint, i.e. mortise and tenon joinery.
mullion: a vertical bar or divider in the frame between windows, doors, or other openings

muntin: A small member that divides the glass or openings of sash or doors.

 

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