The Collaborative International Dictionary of English v.0.48:
Boanerges \Bo`a*ner"ges\ [Gr. ?, fr. Heb. bn[=e] 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.
[1913 Webster]
Easton's 1897 Bible Dictionary:
Boanerges
sons of thunder, a surname given by our Lord to James and John
(Mark 3:17) on account of their fervid and impetuous temper
(Luke 9:54).
Hitchcock's Bible Names Dictionary (late 1800's):
Boanerges, son of thunder