A heavy wall used to isolate buildings or areas which contain highly combustible or explosive materials or to protect a building or area from blast damage when exposed to explosions.

Related Terms


Lean combustible by-product gas resulting from burning coke with a deficiency of air in a blast furnace.


A shaft of concrete placed under a building column or wall and extending down to hard pan or rock. Also known as pier foundation.


The branch of engineering dealing primarily with building 29 architectural engineering architectural millwork materials and components and with the design of structural systems for buildings, in contrast to heavy construction such as bridges.


The area at which barges, towboats and tugs are berthed until needed. The operation of building or dismantling barge tows.


For a fluid confined in a vessel, the rate of flow of heat out of the fluid, per unit area of vessel wall divided by the difference between the temperature in the interior of the fluid and the temperature at the surface of the wall. Also known as convection coefficient.


The space heating needs of a building or an enclosed area expressed in terms of the probable maximum requirement.


  1. A fire-resisting wall separating two parts of a building from the lowest floor to several feet above the roof to prevent the spread of fire. 2. A fire-resisting wall surrounding an oil storage tank to retain oil that may escape and to confine fire.


An exceptionally dense cloud of great vertical development, occurring either as an isolated cloud or one of a line or wall of clouds with separated upper portions. These clouds appear as mountains or huge towers, at least a part of the upper portions of which are usually smooth, fibrous, striated, and almost flattened. This part often spreads out in the form of an anvil or plume. Under the base of cumulonimbus, which often is very dark, there frequently exists virga, precipitation, and low, ragged clouds, either merged with it or not. Its precipitation is often heavy and always of a showery nature. The usual occurrence of lightning and thunder within or from this cloud leads to its being popularly called THUNDERCLOUD and THUNDERHEAD. The latter term usually refers to only the upper portion of the cloud.


  1. On the sea floor, a long, narrow elevation with steep sides. 2. A line or wall of broken ice forced up by pressure. The ridge may be fresh or weathered. 3. In meteorology, an elongated area of relatively high atmospheric pressure, almost always associated with and most clearly identified as an area of maximum anticyclonic curvature of wind flow. The opposite of a ridge is called TROUGH. Sometimes called WEDGE.


A wall or enclosure made of a material designed to absorb ionizing radiation, shielding the operator from an area where radioactive material is being used or processed barrow See handbarrow; wheelbarrow.

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