nip·py / ˈnipē/ • adj. (-pi·er, -pi·est) inf. 1. (of the weather) rather cold; chilly: it's a bit nippy this morning.2. inclined to nip or bite: macaws can sometimes be nippy and unpredictable.DERIVATIVES: nip·pi·ly / ˈnipəlē/ adv.

Nippy (nip-i) n. trade name for a brand of noninvasive positive-pressure ventilator that delivers air through a close-fitting nasal mask (see noninvasive ventilation).