large 16th-century bass lute provided with additional bass strings, or diapasons, and producing a deeper sound that could be used in orchestral basso continuo parts. The diapasons were tuned according to individual preference, usually in a descending scale from the lowest principal string. There were three main varieties of archlute: the chitarrone, theorbo (qq.v.), and theorbo-lute, or French lute. The angelica, or angel lute, of the 17th and 18th centuries, was related but had diatonically tuned strings and no frets.
ARCHLUTE
Meaning of ARCHLUTE in English
Britannica English vocabulary. Английский словарь Британика. 2012