Baretti: A dictionary of the English and Italian languages
Gús-cio, s. m. dim. Gús-cétto,
1. cod, bark, husk, shell; 2. whatever in form of a husk or shell covers or contains any thing; 3. the body of a coach; 4. the bulk of a ship; 5. the scales or basin of a balance. Cattivo, tristo infin nel —,bad, unfortunate from one's birth. Nascer d'un —, to be produced from an egg. Riuscire del —, to change one's dress or costume. Trar l'anima del —, to kill.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
guscio: a huske, a shale, a cod, a shell namely of egges or nuts.