jack-o'-lantern
Pronunciation:
/ˈdʒæk.əʊˌlæn.tən//ˈdʒæk.oʊˌlæn.tɚn/noun
Definitions
A carved pumpkin whose top and stem have been cut out and interior removed, leaving a hollow shell that is then decorated to represent a face, illuminated from within by a candle.
A will o' the wisp.