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.
(Chem.) Resembling ice; having the appearance and consistency of ice; -- said of certain solid compounds; as,
glacial phosphoric or acetic acids.
(Chem.), an acid of such strength or purity as to crystallize at an ordinary temperature, in an icelike form; as acetic or carbolic acid. --
(Geol.), earth and rocks which have been transported by moving ice, land ice, or icebergs; bowlder drift. --
(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. --
Glacier theory, under Glacier.
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