fen

ot noun

1. A type of wetland fed by ground water and runoff, containing peat below the waterline, characteristically alkaline.
2. Unit of currency in China, one-hundredth of a yuan
3. Fans; a plural form used by enthusiasts of science fiction, fantasy, and anime, partly from whimsy and partly to distinguish themselves from fans of sport, etc.
4. A kind of mildew that grows on hops.