GNU Collaborative International Dictionary of English

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1.       
   Glacial , a. [L. glacialis, from glacies ice: cf. F. glacial.]
   Pertaining to ice or to its action; consisting of ice; frozen; icy; esp., pertaining to glaciers; as, glacial phenomena.
   Lyell.
   
   1913 Webster
   (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