Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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marsh gas a gas, mostly methane, that is produced by the decomposition of organic matter.
marsh hawk see northern harrier.
marsh mallow a pink-flowered European mallow common to marshes and now growing in eastern North America, the root of which was once an ingredient in the confection known as marshmallow.
marsh marigold a plant bearing bright yellow flowers that grows in marshes and lowland meadows; cowslip.
salt marsh lowlands near and often flooded by sea water.