Source : Webster's Revised Unabridged Dictionary (1913)

Boanerges \Bo`a*ner"ges\ [Gr. ?, fr. Heb. bn? hargem sons of
   thunder. -- an appellation given by Christ to two of his
   disciples (James and John). See Mark iii. 17.]
   Any declamatory and vociferous preacher or orator.