• IPA: /fɛn/

fen (plural fens)

1. A type of wetland fed by ground water and runoff, containing peat below the waterline, characteristically alkaline.
   • 1610–1611, William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act I, scene ii], page 4 ↗:

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   • 1807, William Wordsworth, "England, 1802," collected in Poems (1807):

     Milton! thou shouldst be living at this hour:

     England hath need of thee: she is a fen

     Of stagnant waters […]

   • 1842, Henry Wadsworth Longfellow, The Slave in the Dismal Swamp, from Poems on Slavery:

     In dark fens of the Dismal Swamp / The hunted Negro lay; [...]

• Russian: боло́то

fen (plural fens)

1. unit of currency in China, one-hundredth of a yuan

1. (dated, fandom) 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.

1. (obsolete) Used in children's games to prevent or forestall another player's action; a check or bar.