The Collaborative International Dictionary of English v.0.48:

Shower \Show"er\, v. t. [imp. & p. p. Showered; p. pr. & vb.
   n. Showering.]
   1. To water with a shower; to ??t copiously with rain.
      [1913 Webster]

            Lest it again dissolve and shower the earth.
                                                  --Milton.
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   2. To bestow liberally; to destribute or scatter in ?undance;
      to rain. --Shak.
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            C?sar's favor,
            That showers down greatness on his friends.
                                                  --Addison.
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The Collaborative International Dictionary of English v.0.48:

Shower \Show"er\, n.
   1. One who shows or exhibits.
      [1913 Webster]

   2. That which shows; a mirror. [Obs.] --Wyclif.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shower \Show"er\, n. [OE. shour, schour, AS. se?r; akin to D.
   schoer, G. schauer, OHG. sc?r, Icel. sk?r, Sw. skur, Goth.
   sk?ra windis a storm of wind; of uncertain origin.]
   1. A fall or rain or hail of short duration; sometimes, but
      rarely, a like fall of snow.
      [1913 Webster]

            In drought or else showers.           --Chaucer.
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            Or wet the thirsty earth with falling showers.
                                                  --Milton.
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   2. That which resembles a shower in falling or passing
      through the air copiously and rapidly.
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            With showers of stones he drives them far away.
                                                  --Pope.
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   3. A copious supply bestowed. [R.]
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            He and myself
            Have travail'd in the great shower of your gifts.
                                                  --Shak.
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   Shower bath, a bath in which water is showered from above,
      and sometimes from the sides also.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shower \Show"er\, v. i.
   To rain in showers; to fall, as in a hower or showers.
   --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shower
    n 1: a plumbing fixture that sprays water over you; "they
         installed a shower in the bathroom"
    2: washing yourself by standing upright under water sprayed from
       a nozzle; "he took a shower after the game" [syn: shower,
       shower bath]
    3: a brief period of precipitation; "the game was interrupted by
       a brief shower" [syn: shower, rain shower]
    4: a sudden downpour (as of tears or sparks etc) likened to a
       rain shower; "a little shower of rose petals"; "a sudden
       cascade of sparks" [syn: shower, cascade]
    5: someone who organizes an exhibit for others to see [syn:
       exhibitor, exhibitioner, shower]
    6: a party of friends assembled to present gifts (usually of a
       specified kind) to a person; "her friends organized a baby
       shower for her when she was expecting"
    v 1: expend profusely; also used with abstract nouns; "He was
         showered with praise" [syn: lavish, shower]
    2: spray or sprinkle with; "The guests showered rice on the
       couple"
    3: take a shower; wash one's body in the shower; "You should
       shower after vigorous exercise"
    4: rain abundantly; "Meteors showered down over half of
       Australia" [syn: shower, shower down]
    5: provide abundantly with; "He showered her with presents"

Moby Thesaurus II by Grady Ward, 1.0:

309 Moby Thesaurus words for "shower":
   Finnish bath, Japanese bath, Kaffeeklatsch, Russian bath,
   Scotch mist, Swedish bath, Turkish bath, abound, abundance, accord,
   administer, aerosol, affluence, afford, allot, allow,
   ample sufficiency, ampleness, amplitude, aquamanile, aspergil,
   aspergillum, atomizer, automatic dishwasher, avalanche, award,
   ball, baptize, barrage, basin, bath, bathe, bathtub, bestow,
   bestow on, bidet, blood rain, blowout, bombard, bombardment,
   bonanza, bountifulness, bountiousness, bristle with, broadside,
   bumper crop, burst, cannonade, clyster, cocktail party,
   coffee klatch, cold shower, communicate, concentrate sprayer,
   confer, copiousness, costume party, crawl with, creep with, deal,
   deal out, deluge, descend, dinner, dinner party, dish out, dishpan,
   dishwasher, dispense, dole, dole out, donate, donation party,
   douche, drizzle, drop, drum, drumfire, enema, entertainment,
   evening mist, ewer, extend, extravagance, exuberance, exuberate,
   fall, fertility, festivity, finger bowl, flood, flow, flurry,
   flush, flush out, foam, foison, fork out, fountain syringe, froth,
   full measure, fullness, fusillade, garden party, gargle,
   generosity, generousness, gift, gift with, give, give freely,
   give out, gout of rain, grant, great abundance, great plenty, gush,
   hail, hand out, heap, help to, hen party, hip bath, holystone,
   house party, house-raising, housewarming, hummum, impart, inundate,
   irrigate, issue, kitchen sink, landslide, lather, launder, lavabo,
   lavatory, lave, lavish, lavishness, lawn party, let have,
   liberality, liberalness, lots, luxuriance, mask, masque,
   masquerade, masquerade party, maximum, mete, mete out, mist,
   mist concentrate sprayer, misty rain, mizzle, moisture, mop,
   mop up, more than enough, much, myriad, myriads, needle bath,
   nozzle, numerousness, offer, opulence, opulency, outpouring,
   overflow, overwhelm, party, patter, pelt, piscina, pitter-patter,
   plash, plenitude, plenteousness, plentifulness, plenty,
   plunge bath, pour, pour with rain, precipitate, precipitation,
   present, prevalence, prodigality, productiveness, proffer,
   profuseness, profusion, proliferate, quantities, rain,
   rain tadpoles, raindrop, rainfall, rainwater, render, repleteness,
   repletion, rich harvest, rich vein, richness, rinse, rinse out,
   riot, riotousness, ritually immerse, run over, salvo, sauna,
   sauna bath, scads, scour, scrub, scrub up, serve, shampoo, shatter,
   sheet of rain, shell out, shindig, shindy, shower bath,
   shower curtain, shower down, shower head, shower room,
   shower stall, showers, sink, sitz bath, slip, slosh, sluice,
   sluice out, smoker, snow, soap, sparge, sparger, spate, spatter,
   spindrift, spit, splash, splatter, sponge, sponge bath, spray,
   spray can, sprayer, sprinkle, sprinkler, sprinkler head,
   sprinkling, sprinkling system, spume, stag, stag party, storm,
   stream, substantiality, substantialness, superabundance,
   surprise party, swab, swarm with, swash, sweat bath, syringe,
   tattoo, teem, teem with, teemingness, tender, toivel, torrent, tub,
   unfrozen hydrometeor, vouchsafe, wash, wash barrel, wash boiler,
   wash out, wash up, washbasin, washbowl, washdish, washer,
   washing machine, washing pot, washpot, washstand, washtub,
   watercart, watering can, watering pot, wealth, weep, wet,
   whirlpool bath, yield