WordReference Random House Unabridged Dictionary of American English © 2025
pitch′ line′, [Mach.]
  1. Mechanical EngineeringSee pitch circle. 
  2. Mechanical Engineeringan 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.
  • 1790–1800

'pitch line' also found in these entries (note: many are not synonyms or translations):
addendum - pitch circle

Forum discussions with the word(s) "pitch line" in the title:


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