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Motor Control

A device that governs the electric power delivered to one or more electric motors.

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Mortise

A slot cut into a board, plank, or timber, usually edgewise, to receive the tenon (or tongue) of another board, plank, or timber to form a joint.

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Motor Control Center

Controllers used to start and stop electric motors and protect them from overloads.

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Moving Walk

A conveyor belt system operating at floor level used to move people in a horizontal direction.

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Moving Ramp

A conveyor belt system used to move people or packages up or down an incline.

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Mudsill

Bottom horizontal member of an exterior wall frame which rests on top a foundation, sometimes called sill plate. Also sole plate, bottom member of interior wall frame.

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Mosaic

A decoration made up of small pieces of inlaid stone, glass, or tile.

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Moulding (also Molding)

Narrow decorative strip applied to a surface.

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Mullion

A vertical divider in the frame between windows, doors, or other openings. Vertical bar or division in a window frame separating two or more panes.

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Multiple Dwelling

A building containing three or more dwelling units.

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Nail Popping

The loosening of nails holding gypsum board to a wall or ceiling. It produces a bulge in the surface of the gypsum panel.

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Muntin

A small member that divides the glass or openings of sash or doors. Horizontal bar or division in a window frame separating multiple panes or lights.

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Nail Pop

The protrusion of the nail usually attributed to the shrinkage of or use of improperly cured wood framing.

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Mutagen

A substance that can induce an alteration in the structure of DNA (EPA IRIS Glossary) https://healthymaterialslab.org/tool-guides/hml-resources

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Natural Fibers

Fibers found in nature, such as wool and cotton.

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Nanomaterial

A substance intentionally engineered to achieve size-dependent properties and functions with one or more external dimensions or an internal structure measuring less than 100 nanometers. https://healthymaterialslab.org/tool-guides/hml-resources

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Nail inspection

An inspection made by a municipal building inspector after the drywall material is hung with nails and screws (and before taping).

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Music/Machinery Transmission Class (MTC)

Rating developed by U.S. Gypsum Company to isolate music and machinery/mechanical equipment noise or any sound with a substantial portion of low frequency energy. MTC does not replace Sound Transmission Class (STC) but complements it.

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Mushroom

The unacceptable occurrence when the top of a caisson concrete pier spreads out and hardens to become wider than the foundation wall thickness.