Baretti: A dictionary of the English and Italian languages
Alterá-re, v. a.
1. to alter, change; 2. to corrupt, spoil; v. r. to become moved, incensed, to fly into a passion; s. m. Alterá-tóre, f. Alterá-tríce; adj.Alterá-nte .
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
alterare: to alter, to change. Also to make one become angry.