a body of water occupying a roughly circular, steep-sided volcanic crater or caldera.
Origin of crater lake
First recorded in 1875–80
a lake in the crater of an extinct volcano in SW Oregon, in Crater Lake National Park. 20 sq. mi. (52 sq. km); 1996 feet (608 meters) deep.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019