fen

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An area of low wet land having peaty soil and typically being less acidic than a bog.

from The Century Dictionary.

• To forbid: same as fend : used in this form by boys in marbles and other games, in an exclamatory way, to check or block, according to understood rules, some move of an opposing player.
• noun Low land covered wholly or partially with water, but producing sedge, coarse grasses, or other aquatic plants; boggy land; a bog; a marsh: as, the bogs in Ireland, or the fens in Lincolnshire, Kent, and Cambridgeshire, England.
• noun Mud; mire.
• noun A disease affecting hops, caused by a quick-growing moss or mold. Imp. Dict.
• noun A section in the work of the Arabic physician Avicenna, called the Canon.

from the GNU version of the Collaborative International Dictionary of English.

• noun Low land overflowed, or covered wholly or partially with water, but producing sedge, coarse grasses, or other aquatic plants; boggy land; moor; marsh.
• noun a boat of light draught used in marshes.
• noun (Zoöl.), [Prov. Eng.] a wild duck inhabiting fens; the shoveler.
• noun (Zoöl.) any water fowl that frequent fens.
• noun (Zoöl.), [Prov. Eng.] the graylag goose of Europe.
• noun swamp land.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A plural form of fan used by enthusiasts of science fiction, fantasy, and anime, partly from whimsy and partly to distinguish themselves from fans of sport, etc.
• noun A type of wetland fed by ground water and runoff, containing peat below the waterline.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun low-lying wet land with grassy vegetation; usually is a transition zone between land and water
• noun 100 fen equal 1 yuan in China