| 单词 | crater |
| 释义 | crater —crateral, craterous, adj. —craterlike, adj. /kray"teuhr/, n., gen. Crateris /kray tear"is/ for 9, v. n. 1. the cup-shaped depression or cavity on the surface of the earth or other heavenly body marking the orifice of a volcano. 2. Also called impact crater, meteorite crater. (on the surface of the earth, moon, etc.) a bowl-shaped depression with a raised rim, formed by the impact of a meteoroid. Cf. astrobleme. 3. Astron. (on the surface of the moon) a circular or almost circular area having a depressed floor, almost always containing a central mountain and usually completely enclosed by walls that are often higher than those of a walled plain; ring formation; ring. Cf. walled plain. 4. the bowllike orifice of a geyser. 5. the hole or pit in the ground where a bomb, shell, or military mine has exploded. 6. Elect. the cavity formed in a positive carbon electrode by an electric arc. 7. Gk. and Rom. Antiq. krater. 8. Metalworking. a depression at the end of a bead produced by welding. 9. (cap.) Astron. the Cup, a small southern constellation west of Corvus and north of Hydra. v.t. 10. to make craters in: Bombs had cratered the landscape. 11. Slang. a. to cancel, abandon, or cast aside: to crater the new project. b. to destroy or ruin: One more disappointment won't crater me. v.i. 12. to form a crater or craters: The surface of the concrete cratered and cracked under the repeated impacts. [1605-15; < L < Gk kratér mixing bowl, lit., mixer, equiv. to kra- (base of kerannýnai to mix) + -ter agentive suffix; cf. CRASIS] |
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