The Collaborative International Dictionary of English v.0.48:

Bellow \Bel"low\, v. i. [imp. & p. p. Bellowed; p. pr. & vb.
   n. Bellowing.] [OE. belwen, belowen, AS. bylgean, fr.
   bellan; akin to G. bellen, and perh. to L. flere to weep,
   OSlav. bleja to bleat, Lith. balsas voice. Cf. Bell, n. &
   v., Bawl, Bull.]
   1. To make a hollow, loud noise, as an enraged bull.
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   2. To bowl; to vociferate; to clamor. --Dryden.
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   3. To roar; as the sea in a tempest, or as the wind when
      violent; to make a loud, hollow, continued sound.
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            The bellowing voice of boiling seas.  --Dryden.
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