GNU Collaborative International Dictionary of English
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Crater (krāˈtẽr), n. [L. crater, cratera, a mixing vessel, the mouth of a volcano, Gr. κρατήρ, fr. κεραννύναι to mix; cf. Skr. çrī to mix, çir to cook, çrā 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.
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2. (Mil.) The pit left by the explosion of a bomb, shell, or mine.
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3. (Astron.) A constellation of the southern hemisphere; -- called also the Cup.
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