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2017 Word of the Year

pitch surface

noun
1.
(in a gear or rack) an imaginary surface forming a plane (pitch plane) a cylinder (pitch cylinder) or a cone or frustrum (pitch cone) that moves tangentially to a similar surface in a meshing gear so that both surfaces travel at the same speed.
Origin of pitch surface
1885-1890
First recorded in 1885-90
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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12
13
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