• Cotter Definition & Synonyms
- (n.) A piece of wood or metal, commonly wedge-shaped, used for fastening together parts of a machine or structure. It is driven into an opening through one or all of the parts. [See Illust.] In the United States a cotter is commonly called a key.
- (n.) Alt. of Cottar
- (n.) A toggle.
- (v. t.) To fasten with a cotter.