fen

Concise Oxford English Dictionary © 2008 Oxford University Press:
fen1

▶noun a low and marshy or frequently flooded area of land.

■ (the Fens) flat low-lying areas of Lincolnshire, Cambridgeshire, and Norfolk, formerly marshland but now largely drained.

■ Ecology wetland with alkaline, neutral, or only slightly acid peaty soil.

Compare with bog.

– derivatives
fenny adjective.

– origin OE fen(n), of Gmc origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
fen2

▶noun (pl. same) a monetary unit of China, equal to one hundredth of a yuan.

– origin from Chin. fēn ‘a hundredth part’.