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Definition of crater

i. A typically bowl-shaped or saucer-shaped pit or depression, generally of considerable size and with steep inner slopes, formed on a surface or in the ground by the explosive release of chemical or kinetic energy; e.g., an impact crater or an explosion crater.

Ref: AGI

ii. A basinlike, rimmed structure that is usually at the summit of a volcanic cone. It may be formed by collapse, by an explosive eruption, or by the gradual accumulation of pyroclastic material into a surrounding rim.

Compare with: caldera

iii. The formation of a large funnel-shaped cavity at the top of a well, resulting from a blowout or occasionally from caving.

Ref: Brantly, 1

iv. In blasting, the funnel of rupture, which in bad rock may have very steep sides and a relatively small volume of broken rock.

Synonym of: lunar crater
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