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Related to maar: MAARI
A broad, shallow, generally flat-floored volcanic crater of explosive origin that is often filled with water.
[German, from Vulgar Latin *mara, standing water, lake, from Latin mare, sea; see mare2.]
n, pl maars or maare (ˈmɑːrə)
(Physical Geography) (sometimes capital) a coneless volcanic crater that has been formed by a single explosion
[C19: from German]