The Collaborative International Dictionary of English v.0.48:

Rant \Rant\ (r[a^]nt), v. i. [imp. & p. p. Ranted; p. pr. &
   vb. n. Ranting.] [OD. ranten, randen, to dote, to be
   enraged.]
   To rave in violent, high-sounding, or extravagant language,
   without dignity of thought; to be noisy, boisterous, and
   bombastic in talk or declamation; as, a ranting preacher.
   [1913 Webster]

         Look where my ranting host of the Garter comes! --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ranting
    n 1: a loud bombastic declamation expressed with strong emotion
         [syn: harangue, rant, ranting]

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "ranting":
   Dionysiac, abandoned, afebrile delirium, amok, babbling, bacchic,
   bellowing, berserk, blustering, blusterous, blustery, boisterous,
   brainstorm, bullying, carried away, corybantic, delirious,
   deliriousness, delirium, demoniac, desperate, distracted, dizzy,
   ecstatic, enraged, enraptured, feral, ferocious, fierce,
   fighting mad, frantic, frenetic, frenzied, fulminating, fuming,
   furious, giddy, haggard, hectoring, hog-wild, hopping mad, howling,
   hysterical, in a rage, in a transport, in hysterics, incoherence,
   incoherent, infuriate, infuriated, intoxicated, lightheaded,
   like one possessed, lingual delirium, mad, madding, maenadic,
   maniac, maniacal, noisy, off, orgasmic, orgiastic, possessed,
   rabid, raging, rambling, ramping, raving, raving mad, ravished,
   roaring, roaring mad, roistering, roisterous, rollicking,
   running mad, running wild, savage, stark-raving mad, storming,
   swaggering, swashbuckling, swashing, transported, tumultuous,
   uncontrollable, violent, wandering, wild, wild-eyed,
   wild-looking