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.Glacialepoch or 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.Glacialtheory or hypothesis. (Geol.) See Glacier theory, under Glacier.

(Gla"cial*ist), n. One who attributes the phenomena of the drift, in geology, to glaciers.

(Gla"ci*ate) v. i. [L. glaciatus, p. p. of glaciare to freeze, fr. glacies ice.] To turn to ice.

(Gla"ci*ate), v. t.

1. To convert into, or cover with, ice.

2. (Geol.) To produce glacial effects upon, as in the scoring of rocks, transportation of loose material, etc.

Glaciated rocks, rocks whose surfaces have been smoothed, furrowed, or striated, by the action of ice.

(Gla`ci*a"tion) n.

1. Act of freezing.

2. That which is formed by freezing; ice.

3. The process of glaciating, or the state of being glaciated; the production of glacial phenomena.

(Gla"cier) n. [F. glacier, fr. glace ice, L. glacies.] An immense field or stream of ice, formed in the region of perpetual snow, and moving slowly down a mountain slope or valley, as in the Alps, or over an extended area, as in Greenland.

The mass of compacted snow forming the upper part of a glacier is called the firn, or névé; the glacier proper consist of solid ice, deeply crevassed where broken up by irregularities in the slope or direction of its path. A glacier usually carries with it accumulations of stones and dirt called moraines, which are designated, according to their position, as lateral, medial, or terminal (see Moraine). The common rate of flow of the Alpine glaciers is from ten to twenty inches per day in summer, and about half that in winter.

(Gla"brate) a. [L. glabrare, fr. glaber smooth.] (Bot.) Becoming smooth or glabrous from age. Gray.

(Gla"bre*ate Gla"bri*ate) v. t. [See Glabrate.] To make smooth, plain, or bare. [Obs.]

(Glab"ri*ty) n. [L. glabritas.] Smoothness; baldness. [R.]

(Gla"brous) a. [L. glaber; cf. Gr. hollow, smooth, to hollow.] Smooth; having a surface without hairs or any unevenness.

(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.

2. (Chem.) Resembling ice; having the appearance and consistency of ice; — said of certain solid compounds; as, glacial phosphoric or acetic acids.

  By PanEris using Melati.

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