any implement for plucking a string, such as a small piece of plastic, wood, etc, used to strum a guitar, or the quill that plucks the string of a harpsichord
[C17: from Latin plēctrum quill, plectrum, from Greek plektron, from plessein to strike]
1626, from L. plectrum, from Gk. plektron "thing to strike with" (pick for a lyre, cock's supr, spear point, etc.), from plek-, root of plessein "to strike."