ice-crystal cloud

ice-crystal cloud

[′īs ‚krist·əl ‚klau̇d]
(meteorology)
A cloud consisting entirely of ice crystals, such as cirrus (in this sense distinguished from water clouds and mixed clouds), and having a diffuse and fibrous appearance quite different from that typical of water droplet clouds.
References in periodicals archive ?
As storms mature they appear to be composed of three visible parts: a bright white-yellow core, a surrounding ochre pall obscuring surface features, and small peripheral ice-crystal clouds that are bright in blue light.
There was, in fact, a proliferation of ice-crystal clouds and hazes immediately prior to each of the 1990 storms).