adjective

1. of or like ice or glaciers
2. of or produced by a glacier or a glacial epoch or period
3. freezing; frigid glacial weather
4. cold and unfriendly a glacial stare
5. as slow as the movement of a glacier glacial progress
6. Chem. having an icelike, crystalline appearance

Etymology: L glacialis, icy, frozen < glacies, ice < IE *glag-, partial redupl. of base *gel-, to freeze > cold