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| Medium btu gas
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Fuel gas with a heating value of between 200 and 300 BTU per cubic foot. |
| Medium curing cutback
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Kerosene thinned asphalt, which stays liquid when temperatures drop. |
| Medium density fiberboard (mdf)
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Wood scraps and plant fibers compressed together with a binding material, such as glue and pressed out to form a sheet material which is used in construction as wall sheathing, floor underlayment or in any area that is to be covered with a veneer or finish surface. |
| 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. |
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