The Collaborative International Dictionary of English v.0.48:

Baal \Ba"al\ (b[=a]"al), n.; Heb. pl. Baalim (-[i^]m). [Heb.
   ba'al lord.]
   1. (Myth.) The supreme male divinity of the Phoenician and
      Canaanitish nations.
      [1913 Webster]

   Note: The name of this god occurs in the Old Testament and
         elsewhere with qualifying epithets subjoined, answering
         to the different ideas of his character; as,
         Baal-berith (the Covenant Baal), Baal-zebub (Baal of
         the fly).
         [1913 Webster]

   2. pl. The whole class of divinities to whom the name Baal
      was applied. --Judges x. 6.
      [1913 Webster]

Easton's 1897 Bible Dictionary:

Baalim
   plural of Baal; images of the god Baal (Judg. 2:11; 1 Sam. 7:4).


Hitchcock's Bible Names Dictionary (late 1800's):

Baalim, idols; masters; false gods