theorbo UK /θiˈɔː.bəʊ/US /θiˈɔɹ.boʊ/ noun1 •A baroque, double-necked lute having an extra set of open bass strings.So when they said yea to this, he called to him his player on the theorbo and his player on the hautboy, and commanded them saying, “Play me a solemn music.” — 1922 formstheorboes · theorbos