glacial (adj.) Look up glacial at Dictionary.com
1650s, "cold, icy," from French glacial, from Latin glacialis "icy, frozen, full of ice," from glacies "ice," probably from PIE root *gel- "cold" (cognates: Latin gelu "frost;" see cold (adj.)). Geological sense apparently coined in 1846 by British naturalist Edward Forbes (1815-1854). Related: Glacially.