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M___
Definitions
a flat-bottomed volcanic crater that was formed by an explosion; often filled with water
Word origin
Borrowed from German Maar; English usage from 1825, from Vulgar Latin *mara (“standing water”), from Latin mare (“sea”). Doublet of mare (“a large, dark plain; a lake on Titan”) and mere (“a body of standing water”).
Source: Wiktionary, CC BY-SA 4.0
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