Friction-layer
noun
1.
.
noun, Meteorology.
1.
the thin layer of air adjacent to the earth’s surface, usually considered to be less than 300 feet (91 meters) high.
noun
1.
the atmospheric layer extending up to about 600 m, in which the aerodynamic effects of surface friction are appreciable
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noun 1. a high-speed circular saw, usually toothless, that is used for cutting metals by using frictional heat to melt the material adjacent to it.