Definition of crater lake:
(n) :
(geology) A lake that has formed in the caldera of a volcano.
(n) :
Several lakes in Chugach Census Area, Copper River Census Area, Nome Census Area and Prince of Wales–Hyder Census Area and Juneau borough, Kodiak Island Borough, Matanuska-Susitna Borough and Yakutat borough, Alaska.
(n) :
Three lakes in Coconino County, Arizona.
(n) :
Several lakes in Alpine County, Fresno County, Lassen County, Nevada County and Siskiyou County, California.
(n) :
Several lakes in Alamosa County, Archuleta County, Delta County, Garfield County, Grand County, Pitkin County, Rio Blanco County and San Juan County, Colorado.
(n) :
Several lakes in Custer County, Idaho County, Lemhi County, Lincoln County, Minidoka County, Owyhee County, Shoshone County and Valley County, Idaho.