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From The Collaborative International Dictionary of English v.0.48:
Fen \Fen\ (f[e^]n), n. [AS. fen, fenn, marsh, mud, dirt; akin to D. veen, OFries. fenne, fene, OHG. fenna, G. fenn, Icel. fen, Goth. fani mud.] Low land overflowed, or covered wholly or partially with water, but producing sedge, coarse grasses, or other aquatic plants; boggy land; moor; marsh. [1913 Webster] 'Mid reedy fens wide spread. --Wordsworth. [1913 Webster] Note: Fen is used adjectively with the sense of belonging to, or of the nature of, a fen or fens. [1913 Webster] Fen boat, a boat of light draught used in marshes. Fen duck (Zool.), a wild duck inhabiting fens; the shoveler. [Prov. Eng.] Fen fowl (Zool.), any water fowl that frequent fens. Fen goose (Zool.), the graylag goose of Europe. [Prov. Eng.] Fen land, swamp land. [1913 Webster]