Origin: LL(Ec) < Gr(Ec) Beelzeboub < Heb baal-zevuv, lit., god of flies < baal (see Baal) + zevuv, a fly: prob. deliberate pejorative alteration < Baʼal zebul; cf. Ugaritic zbl bʿl ʾrs, the exalted one, the lord of the earth
See Beelzebub in American Heritage Dictionary 4
Origin: Hebrew ba‘al zəbûb, lord (of the) fly
Origin: , alteration of ba‘al zəbûl, lord prince; see bעl in Semitic roots.
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