1 a low marshy or flooded area of land.
2 (the Fens) flat low-lying areas in and around Cambridgeshire.
Phrases and idioms:
fen-berry (pl. -berries) a cranberry. fen-fire will-o'-the-wisp.
Derivatives:
fenny adj.
Etymology: OE fenn f. Gmc
Useful english dictionary. 2012.