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pitch line

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noun Machinery.
  1. pitch circle.
  2. an imaginary line within the profiles of the teeth of a rack, such that it moves against, and at the same rate as, the pitch circle of an engaging pinion.

Origin of pitch line

First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018