Baretti: A dictionary of the English and Italian languages
Castéll-o, s. m. dim. Castéll-étto, Castéll-ína, disp. Castéll-áccio,Castéll-ótto , Castéll-úccio,
1. castle, chateau, seat. Far castelli in aria, to build castles in the air; 2. a small village, borough; 3. fortress, castle. — di prua, fore-castle. — di poppa, quarter-deck;4. a monkey for driving in piles; 5. a tourniquet;6. the wards of a lock.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
castello: any kinde of castle. Also the vpper part of any engine of warre.