This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
Parasitic ice was a form of ice that expanded rapidly, covering and eventually crushing everything it touched; Zareh noted he had once seen it enter a person's throat. Its growth accelerated in the shade.
The surface of the Colony contained glaciers of parasitic ice. In 3189, the USS Discovery crash-landed on one of these glaciers and was nearly enveloped by the ice before it was pulled free by a tractor beam from Michael Burnham's ship. (DIS: "Far From Home")