Lewis & Short

prŭīnōsus, a, um, adj. [pruina].

  1. I. Full of hoar-frost, frosty, rimy: herbae, Ov. M. 4, 82: nox, id. Am. 2, 19, 22: axis (Aurorae), id. ib. 1, 6, 65; 1, 13, 2: equi Noctis, id. P. 1, 2, 56: caeli status, Col. 4, 23, 2.
  2. * II. Transf.: panni, cold, i. e. affording no warmth, Petr. 83 fin.