Barbiton n. : An ancient Greek instrument resembling a lyre.

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Taxonomy
barbiton, instrument, lyre, lute, barbat, strings, barbitos, rebab, musical instruments, stringed instrument, string instrument, free encyclopedia, bass instrument, Greek, Greece, illustration, gut strings, Persian.

Defination from the web:
barbiton or barymite (from βάρυς, heavy and μίτος, a string), an instrument producing deep sounds. ... The people called it theorbo, but the scholar having identified it with the instrument of classic Greece and Rome called it barbiton. ...