A fen is a marshy area — a damp, grassy area of ground. If your entire back yard is a fen, you'll want to wear tall rubber boots when you walk your dog.

A fen is similar to a marsh, a mire, a swamp, or a bog. In all of these wetland ecosystems, the water level tends to rise and fall, leaving them constantly soggy to some degree. Fens are distinguished by the kinds of plants that grow there, including tall grasses and moss, and by the acidity of the water. The word fen comes from the Old English fenn, which means "mud, mire, dirt, or marsh."

Definitions of fen
  1. noun
    low-lying wet land with grassy vegetation; usually is a transition zone between land and water
    “the fens of eastern England”
    synonyms: fenland, marsh, marshland
    see moresee less
    salt marsh
    low-lying wet land that is frequently flooded with saltwater
    type of:
    a low area where the land is saturated with water
  2. noun
    100 fen equal 1 yuan in China
    see moresee less
    type of:
    Chinese monetary unit
    the monetary unit in the People's Republic of China
Word Family