Source : Webster's Revised Unabridged Dictionary (1913)

Rubber \Rub"ber\, n.
   1. One who, or that which, rubs. Specifically:
      (a) An instrument or thing used in rubbing, polishing, or
          cleaning.
      (b) A coarse file, or the rough part of a file.
      (c) A whetstone; a rubstone.
      (d) An eraser, usually made of caoutchouc.
      (e) The cushion of an electrical machine.
      (f) One who performs massage, especially in a Turkish
          bath.
      (g) Something that chafes or annoys; hence, something that
          grates on the feelings; a sarcasm; a rub. --Thackeray.

   2. In some games, as whist, the odd game, as the third or the
      fifth, when there is a tie between the players; as, to
      play the rubber; also, a contest determined by the winning
      of two out of three games; as, to play a rubber of whist.
      --Beaconsfield. ``A rubber of cribbage.'' --Dickens.

   3. India rubber; caoutchouc.

   4. An overshoe made of India rubber. [Colloq.]

Source : WordNet®

rubber
     n 1: latex from trees (especially trees of the genera Hevea and
          Ficus) [syn: {India rubber}, {gum elastic}, {caoutchouc}]
     2: an eraser made of rubber (or of a synthetic material with
        properties similar to rubber); commonly mounted at one end
        of a pencil [syn: {rubber eraser}, {pencil eraser}]
     3: contraceptive device consisting of a thin rubber or latex
        sheath worn over the penis during intercourse [syn: {condom},
         {safety}, {safe}, {prophylactic}]
     4: a waterproof overshoe that protects shoes from water or snow
        [syn: {arctic}, {galosh}, {golosh}, {gumshoe}]

rubber
     adj 1: made of rubber and therefore water-repellent; "rubber boots"
            [syn: {rubberized}, {rubberised}]
     2: returned for lack of funds; "a rubber check"; "a no-good
        check" [syn: {no-good}]

rubber
     v : coat or impregnate with rubber; "rubberize fabric for rain
         coats" [syn: {rubberize}, {rubberise}]