crankpin

noun
crank·​pin | \ˈkraŋk-ˌpin \
plural crankpins

Definition of crankpin 

: the cylindrical piece that projects from the arm of a crank and to which a connecting rod is attached (as in a reciprocating engine) — compare journal sense 3

First Known Use of crankpin

1839, in the meaning defined above

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The first known use of crankpin was in 1839

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