Dictionary

jack–o'–lantern

noun jack–o'–lan·tern \ˈja-kə-ˌlan-tərn\

: a pumpkin that has had its insides removed and a face cut into it for Halloween

Full Definition of JACK-O'-LANTERN

2
:  a lantern made of a pumpkin cut to look like a human face
3
:  a large orangish gill fungus (Omphalotus olearius syn. Clitocybe illudens) that is poisonous and luminescent

First Known Use of JACK-O'-LANTERN

1667

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