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glacial (adj.)

1650s, "cold, icy," from French glacial or directly from Latin glacialis "icy, frozen, full of ice," from glacies "ice," probably from a suffixed form of PIE root *gel- "cold; to freeze" (source also of Latin gelu "frost"). Geological sense "pertaining to glaciers" apparently was coined in 1846 by British naturalist Edward Forbes (1815-1854). Hence figurative sense "at an extremely slow rate," as of the advance of glaciers. Related: Glacially.

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Definitions of glacial from WordNet

glacial (adj.)
relating to or derived from a glacier;
glacial deposit
glacial (adj.)
devoid of warmth and cordiality; expressive of unfriendliness or disdain;
a glacial handshake
Synonyms: frigid / frosty / frozen / icy / wintry
glacial (adj.)
extremely cold;
glacial winds
Synonyms: arctic / frigid / gelid / icy / polar
From wordnet.princeton.edu