FEN, noun [Latin fons, Eng. fountain.] Low land overflowed, or covered wholly or partially with water, but producing sedge, coarse grasses, or other aquatic plants; boggy land; a moor or marsh. A long canal the muddy fen divides. FEN'-BERRY, noun A kind of blackberry. FEN'-BORN, adjective Born or produced in a fen FEN'-CRESS, noun Cress growing in fens. FEN'-CRICKET, noun an insect that digs for itself a little hole in the ground. FEN'-DUCK, noun a species of wild duck. FEN'-FOWL, noun any fowl that frequents fens. FEN'-LAND, noun Marshy land.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI