n. A collembolous thysanurous insect which leaps or skips about by means of abdominal hairs acting like a spring, as any poduran.n. A thysanurous insect of the suborder Cinura, oftener called bristletail. See Cinura, Lepisma, and cut under silver fish.n. One of certain minute neuropterous insects of the panorpid genus Boreus, found in moss and on the surface of snow; a snow-fly. This insect springs, but not by means of anal appendages.