Definition of marsh noun from the Oxford Advanced Learner's Dictionary



BrE BrE//mɑːʃ//
; NAmE NAmE//mɑːrʃ//
[countable, uncountable] Other geographic regions
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an area of low land that is always soft and wet because there is nowhere for the water to flow away to Cows were grazing on the marshes. After so much rain, the field had become a marsh (= a very wet area). The land is colonized by various types of marsh vegetation. See related entries: Other geographic regions Word OriginOld English mer(i)sc (perhaps influenced by late Latin mariscus ‘marsh’), of West Germanic origin.
See the Oxford Advanced American Dictionary entry: marsh