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From The Collaborative International Dictionary of English v.0.48:
Glacial \Gla"cial\, a. [L. glacialis, from glacies ice: cf. F. glacial.] 1. Pertaining to ice or to its action; consisting of ice; frozen; icy; esp., pertaining to glaciers; as, glacial phenomena. --Lyell. [1913 Webster] 2. (Chem.) Resembling ice; having the appearance and consistency of ice; -- said of certain solid compounds; as, glacial phosphoric or acetic acids. [1913 Webster] Glacial acid (Chem.), an acid of such strength or purity as to crystallize at an ordinary temperature, in an icelike form; as acetic or carbolic acid. Glacial drift (Geol.), earth and rocks which have been transported by moving ice, land ice, or icebergs; bowlder drift. Glacial epoch or Glacial period (Geol.), a period during which the climate of the modern temperate regions was polar, and ice covered large portions of the northern hemisphere to the mountain tops. Glacial theory or Glacial hypothesis. (Geol.) See Glacier theory, under Glacier. [1913 Webster]