Glacial drift
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]

The Collaborative International Dictionary of English. 2000.

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