1. sharp, smart, biting; 2. satirical, nipping, tart, detracting or taunting. Lingua —, a satirical tongue or person. Mordaci sollecitudini, gnawing cares.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
mordace: hiting, mordant, nipping snipping, pinching, or sharp, be it with teeth or words, bitter in detracting or taunting.