Basic Guidelines For English Spellings
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(In a piano, harpsichord, etc.) one of the pins or pegs set into the bridge to space and align the strings; (on a guitar, ukulele, etc.) the pin which holds the end of each string in place at the bridge.
Late 17th century; earliest use found in Richard Blome (bap. 1630, d. 1705), cartographer and bookseller.