I went into the smoking-room and sat down before the spinet.
1660s, spinette, "small harpsichord," from older French espinette (1520s), from Italian spinetta, said by Scaliger to be a diminutive of spina "thorn, spine," from Latin spina "thorn" (see spine), so called because the strings were plucked with thorn-like quills. The other theory (favored by OED) dates to early 17c. and claims the word is from the name of the Venetian inventor, Giovanni Spinetti (fl. c.1503).