Lewis & Short

ninguĭdus, a, um, adj. [ninguis],

  1. I. full of snow, snowy (post-class.): juga, Aus. Ep. 24, 68: oppida, id. ib. 24, 124: Boreas, Prud. Apophth. 729.
  2. II. Transf., falling like snow: cibus, i. e. manna, Prud. Cath. 5, 97.