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cotter (n.)

"wedge-shaped piece or bolt which fits into a hole used in fastening or tightening," 1640s, of uncertain origin; perhaps a shortened form of cotterel, a dialectal word for "cotter pin or bolt, bracket to hang a pot over a fire" (1560s), itself of uncertain origin. Cotter-pin is attested by 1849.

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Definitions of cotter

cotter (n.)
a peasant farmer in the Scottish Highlands;
Synonyms: cottar
cotter (n.)
a medieval English villein;
Synonyms: cottier
cotter (n.)
fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together;
Synonyms: cottar
From wordnet.princeton.edu