Etymology
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ignis fatuus (n.)

"will o' the wisp, jack-o-lantern," 1560s, Medieval Latin, literally "foolish fire;" see igneous + fatuous. "It seems to have been formerly a common phenomenon; but is now exceedingly rare" [OED].

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Definitions of ignis fatuus

ignis fatuus (n.)
a pale light sometimes seen at night over marshy ground;
Synonyms: friar's lantern / jack-o'-lantern / will-o'-the-wisp
ignis fatuus (n.)
an illusion that misleads;
Synonyms: will-o'-the-wisp
From wordnet.princeton.edu

Dictionary entries near ignis fatuus

-ify

igloo

Ignatius

igneo-

igneous

ignis fatuus

ignitable

ignite

ignition

ignivomous

ignoble