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Cra"ter (kr?t?r), n.[L. crater, cratera, a mixing vessel, the mouth of a volcano, Gr. krath°r, fr. keranny°nai to mix; cf. Skr. r to mix, ir to cook, r to cook. Cf. Grail, in Holy Grail.] 1. The basinlike opening or mouth of a volcano, through which the chief eruption comes; similarly, the mouth of a geyser, about which a cone of silica is often built up. 2. (Mil.) The pit left by the explosion of a mine. 3. (Astron.) A constellation of the southen hemisphere; -- called also the Cup.
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