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Jack-o'-lantern (n.)

also jack-o-lantern, jack-a-lantern, jackolantern, 1660s, "night-watchman;" 1670s as a local name for a will-o-the-wisp (Latin ignis fatuus), mainly attested in East Anglia but also in southwestern England. Literally "Jack of (with) the lantern;" see Jack + lantern. The extension to carved pumpkin lanterns is attested by 1834 in American English.

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Definitions of Jack-o'-lantern from WordNet

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