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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. See ignis fatuus.
  2. n. A delusive or misleading hope.

Century Dictionary and Cyclopedia

  1. n. The ignis fatuus; hence, any person or thing that deludes or misleads by dazzling, visionary, or evanescent appearances. Also will-in-the-wisp, will-with-a-wisp, and Jack o' lantern.
  2. n. A common fresh-water alga, Nostoc commune: so named from its sudden and seemingly mysterious appearance. See Nostoc.

Wiktionary

  1. n. alternative spelling of will o' the wisp.

GNU Webster's 1913

  1. n. See ignis fatuus.

WordNet 3.0

  1. n. a pale light sometimes seen at night over marshy ground
  2. n. an illusion that misleads

Etymologies

  1. From the name Will (nickname for William).

Examples

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Lists

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‘will-o'-the-wisp’ has been looked up 1136 times, loved by 3 people, added to 10 lists, commented on 3 times, and is not a valid Scrabble word.