The Collaborative International Dictionary of English v.0.48:

Waste \Waste\, a. [OE. wast, OF. wast, from L. vastus,
   influenced by the kindred German word; cf. OHG. wuosti, G.
   w["u]st, OS. w?sti, D. woest, AS. w[=e]ste. Cf. Vast.]
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   1. Desolate; devastated; stripped; bare; hence, dreary;
      dismal; gloomy; cheerless.
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            The dismal situation waste and wild.  --Milton.
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            His heart became appalled as he gazed forward into
            the waste darkness of futurity.       --Sir W.
                                                  Scott.
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   2. Lying unused; unproductive; worthless; valueless; refuse;
      rejected; as, waste land; waste paper.
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            But his waste words returned to him in vain.
                                                  --Spenser.
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            Not a waste or needless sound,
            Till we come to holier ground.        --Milton.
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            Ill day which made this beauty waste. --Emerson.
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   3. Lost for want of occupiers or use; superfluous.
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            And strangled with her waste fertility. --Milton.
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   Waste gate, a gate by which the superfluous water of a
      reservoir, or the like, is discharged.

   Waste paper. See under Paper.

   Waste pipe, a pipe for carrying off waste, or superfluous,
      water or other fluids. Specifically:
      (a) (Steam Boilers) An escape pipe. See under Escape.
      (b) (Plumbing) The outlet pipe at the bottom of a bowl,
          tub, sink, or the like.

   Waste steam.
      (a) Steam which escapes the air.
      (b) Exhaust steam.

   Waste trap, a trap for a waste pipe, as of a sink.
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WordNet (r) 3.0 (2006):

waste pipe
    n 1: a pipe through which liquid is carried away [syn: drain,
         drainpipe, waste pipe]