The Collaborative International Dictionary of English v.0.48:

Swell \Swell\, v. i. [imp. Swelled; p. p. Swelled or
   Swollen; p. pr. & vb. n. Swelling.] [AS. swellan; akin to
   D. zwellen, OS. & OHG. swellan, G. schwellen, Icel. svella,
   Sw. sv[aum]lla.]
   1. To grow larger; to dilate or extend the exterior surface
      or dimensions, by matter added within, or by expansion of
      the inclosed substance; as, the legs swell in dropsy; a
      bruised part swells; a bladder swells by inflation.
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   2. To increase in size or extent by any addition; to increase
      in volume or force; as, a river swells, and overflows its
      banks; sounds swell or diminish.
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   3. To rise or be driven into waves or billows; to heave; as,
      in tempest, the ocean swells into waves.
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   4. To be puffed up or bloated; as, to swell with pride.
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            You swell at the tartan, as the bull is said to do
            at scarlet.                           --Sir W.
                                                  Scott.
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   5. To be inflated; to belly; as, the sails swell.
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   6. To be turgid, bombastic, or extravagant; as, swelling
      words; a swelling style.
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   7. To protuberate; to bulge out; as, a cask swells in the
      middle.
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   8. To be elated; to rise arrogantly.
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            Your equal mind yet swells not into state. --Dryden.
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   9. To grow upon the view; to become larger; to expand.
      "Monarchs to behold the swelling scene!" --Shak.
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   10. To become larger in amount; as, many little debts added,
       swell to a great amount.
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   11. To act in a pompous, ostentatious, or arrogant manner; to
       strut; to look big.
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             Here he comes, swelling like a turkey cock. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Swelling \Swell"ing\, n.
   1. The act of that which swells; as, the swelling of rivers
      in spring; the swelling of the breast with pride.
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            Rise to the swelling of the voiceless sea.
                                                  --Coleridge.
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   2. A protuberance; a prominence; especially (Med.), an
      unnatural prominence or protuberance; as, a scrofulous
      swelling.
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            The superficies of such plates are not even, but
            have many cavities and swellings.     --Sir I.
                                                  Newton.
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WordNet (r) 3.0 (2006):

swelling
    n 1: an abnormal protuberance or localized enlargement [syn:
         swelling, puffiness, lump]
    2: something that bulges out or is protuberant or projects from
       its surroundings; "the gun in his pocket made an obvious
       bulge"; "the hump of a camel"; "he stood on the rocky
       prominence"; "the occipital protuberance was well developed";
       "the bony excrescence between its horns" [syn: bulge,
       bump, hump, swelling, gibbosity, gibbousness,
       jut, prominence, protuberance, protrusion,
       extrusion, excrescence]
    3: the increase in volume of certain substances when they are
       heated (often accompanied by release of water) [syn:
       intumescence, intumescency, swelling]

Moby Thesaurus II by Grady Ward, 1.0:

233 Moby Thesaurus words for "swelling":
   abscess, access, accession, accretion, accrual, accruement,
   accumulation, addition, advance, aggrandizement, amplification,
   aposteme, appreciation, ascent, augmentation, aureate, bagging,
   baggy, ballooning, bed sore, bellying, billowing, billowy, blain,
   bleb, blister, bloat, bloated, bloatedness, bloating, blowing up,
   boil, bombastic, boom, boost, bosomy, breaking point, broadening,
   bubo, buildup, bulbose, bulbous, bulge, bulging, bulla, bump,
   bumped, bumpy, bunched, bunchy, bunion, canker, canker sore,
   carbuncle, chancre, chancroid, chilblain, cold sore, corn,
   crescendo, crescendoing, crescent, cyst, development, diastole,
   dilatation, dilation, distended, distension, dropsy, edema,
   elevation, enlargement, eschar, euphuistic, excrescence, expanding,
   expansion, extension, extreme tension, felon, fester, festering,
   fever blister, fistula, flatulence, flatulency, flatulent, flatus,
   flood, flowery, fullness, furuncle, furunculus, fustian, gain,
   gassiness, gassy, gathering, grandiloquent, greatening, growing,
   growth, gumboil, gush, hemorrhoids, hike, hillocky, hummocky,
   increase, increasing, increment, incremental, inflated, inflation,
   intensifying, intensity, intumescence, jump, kibe, leap,
   lengthening, lesion, loudishness, loudness, lump, magniloquent,
   meteorism, mounting, mouthy, moutonnee, multiplication,
   multiplying, node, nodule, on the increase, overdistension,
   overdrawing, overexpansion, overextension, overstrain,
   overstraining, overstretching, papula, papule, paronychia, parulis,
   petechia, piles, pimple, pneumatic, pock, polyp, potbellied,
   pouching, productiveness, proliferating, proliferation, prominence,
   protrusion, protuberance, puff, puffiness, puffing, pustule, raise,
   rise, rising, rounded, scab, sebaceous cyst, snapping point,
   snowballing, soft chancre, sonority, sonorousness, sore, spread,
   spreading, stigma, strain, straining, stretch, stretching, sty,
   suppuration, surge, surge of sound, swell, swellage, swollen,
   swollenness, tension, tightening, tubercle, tumefaction,
   tumescence, tumescent, tumid, tumidity, tumidness, tumor,
   turgescence, turgescency, turgescent, turgid, turgidity,
   turgidness, tympanism, tympany, ulcer, ulceration, up, upping,
   upsurge, upswing, uptrend, upturn, verrucated, verrucose, volume,
   wale, warty, waxing, welt, wen, wheal, whelk, whitlow, widening,
   windiness, windy, wound



Easton's 1897 Bible Dictionary:

Swelling
   of Jordan (Jer. 12:5), literally the "pride" of Jordan (as in
   R.V.), i.e., the luxuriant thickets of tamarisks, poplars,
   reeds, etc., which were the lair of lions and other beasts of
   prey. The reference is not to the overflowing of the river
   banks. (Comp. 49:19; 50:44; Zech. 11:3).