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