/ ˈbɒnfaɪə(r); NAmE ˈbɑːn-/ noun
a large outdoor fire for burning waste or as part of a celebration
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WORD ORIGIN
late Middle English : from bone + fire . The term originally denoted a large open-air fire on which bones were burnt (sometimes as part of a celebration), also one for burning heretics or proscribed literature. Dr Johnson accepted the mistaken idea that the word came from French bon good.