What does archlute or archilute mean?
The definition of archlute and archilute
Arch”lute, Arch”i*lute, n.
Etym: [Cf. F. archiluth, It. arciliuto.] (Mus.)

A large theorbo, or double-necked lute, formerly in use, having the bass strings doubled with an octave, and the higher strings with a unison.