sastruga

noun, plural sas·tru·gi [sas-truh-gee, sah-struh-, sa-stroo-, sah-] /ˈsæs trə gi, ˈsɑ strə-, sæˈstru-, sɑ-/.

1. Usually sastrugi. ridges of snow formed on a snowfield by the action of the wind.

noun

1. one of a series of ridges on snow-covered plains, caused by the action of wind laden with ice particles