\Fen\, 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.
      'Mid reedy fens wide spread.             --Wordsworth.
Note: Fen is used adjectively with the sense of belonging to,
      or of the nature of, a fen or fens.
{Fen boat}, a boat of light draught used in marshes.
{Fen duck} (Zo["o]l.), a wild duck inhabiting fens; the
   shoveler. [Prov. Eng.]
{Fen fowl} (Zo["o]l.), any water fowl that frequent fens.
{Fen goose} (Zo["o]l.), the graylag goose of Europe. [Prov.
   Eng.]
{Fen land}, swamp land.