WordReference Random House Unabridged Dictionary of American English © 2026
cot′ter pin′, [Mach.]
  1. Mechanical Engineeringa cotter having a split end that is spread after being pushed through a hole to prevent it from working loose.
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::
cotter pin n
  1. a split pin secured, after passing through holes in the parts to be attached, by spreading the ends
'cotter pin' also found in these entries (note: many are not synonyms or translations):
cotter - pin - castellated nut

Forum discussions with the word(s) "cotter pin" in the title:


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