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| MEDIUM PRESSURE
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For valves and fittings, implies that they are suitable for working pressures between 125 to 175 pounds per square inch. |
| MEDULLARY RAYS
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Strips of cells extending radially within a tree and varying in height from a few cells in some species to four or more inches in oak. The rays serve primarily to store food and transport it horizontally in the tree. On quartersawn oak, the rays form a conspicuous figure, sometimes referred to as Flecks. |
| MEETING OF THE MINDS
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An agreement, by all parties, to a contract. |
| MEETING RAIL
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The horizontal rail of a double hung sash that fit together when the window is closed. |
| MEGAWATT (MW)
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One thousand kilowatts, or 1 million watts; standard measure of electric power plant generating capacity. |
| MEGAWATT HOUR (MWH)
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One thousand kilowatt-hours or 1 million watt-hours. |
| MELD
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To blend or merge. To unite. |
| MELT
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To change from a solid to a liquid, usually by heat. |
| MELT POINT
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The temperature at which the solid asphalt becomes a liquid. |
| MELT-THROUGH
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Defective welding operation, which allows the heat to melt through the base metal. |
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