WordReference Random House Unabridged Dictionary of American English © 2026
inter′nal gear′, [Mach.]
  1. Mechanical Engineeringa gear having teeth cut on an inner cylindrical surface. Also called annular gear, ring gear. 

'internal gear' also found in these entries (note: many are not synonyms or translations):
annular gear - ring gear

Forum discussions with the word(s) "internal gear" in the title:


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