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From The Collaborative International Dictionary of English v.0.48:
Crater \Cra"ter\ (kr[=a]"t[~e]r), n. [L. crater, cratera, a mixing vessel, the mouth of a volcano, Gr. krath`r, fr. keranny`nai to mix; cf. Skr. [,c]r[imac] to mix, [,c]ir to cook, [,c]r[=a] 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. [1913 Webster] 2. (Mil.) The pit left by the explosion of a bomb, shell, or mine. [1913 Webster] 3. (Astron.) A constellation of the southen hemisphere; -- called also the Cup. [1913 Webster]