clavija

dowel; peg; plug (a pronged connecting device which fits into a mating socket, especially an electrical one)

“Bajo de este árbol indígena, dos guitarristas de uñas como garras y enruladas melenas templaban sus instrumentos, mortificando cuerdas y clavijas.” — Beneath this indigenous tree, two guitarists with clawlike nails and curly manes tuned their instruments, tormenting string and peg.

From Latin clavicula, a partially learned term; cf. the inherited form llavija, lavija from *clavicla. Compare Portuguese chavelha, cravelha. See also the borrowed doublet clavícula.