Baretti: A dictionary of the English and Italian languages
Giurá-re, v. a. & n.
1. to swear, to take an oath;2. to promise upon oath; 3. to betroth, to promise in marriage. — un officio, to swear into office. — colle mani e co'piedi, to take a stringent oath. Donna giurata, the affianced, the bride elect; s. m. Giurá-tóre, f. Giurá-tríce; adj. Giurá-nte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
giurare: to sweare, to protest, to depose. Also a water-fowle, in Latin Colimbus.