The Collaborative International Dictionary of English v.0.48:

Voider \Void"er\, n.
   1. One who, or that which, voids, ?mpties, vacates, or
      annuls.
      [1913 Webster]

   2. A tray, or basket, formerly used to receive or convey that
      which is voided or cleared away from a given place;
      especially, one for carrying off the remains of a meal, as
      fragments of food; sometimes, a basket for containing
      household articles, as clothes, etc.
      [1913 Webster]

            Piers Plowman laid the cloth, and Simplicity brought
            in the voider.                        --Decker.
      [1913 Webster]

            The cloth whereon the earl dined was taken away, and
            the voider, wherein the plate was usually put, was
            set upon the cupboard's head.         --Hist. of
                                                  Richard
                                                  Hainam.
      [1913 Webster]

   3. A servant whose business is to void, or clear away, a
      table after a meal. [R.] --Decker.
      [1913 Webster]

   4. (Her.) One of the ordinaries, much like the flanch, but
      less rounded and therefore smaller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

voider
    n 1: an official who can invalidate or nullify; "my bank check
         was voided and I wanted to know who the invalidator was"
         [syn: invalidator, voider, nullifier]
    2: a person who defecates [syn: defecator, voider,
       shitter]
    3: a piece of chain mail covering a place unprotected by armor
       plate [syn: voider, gusset]
    4: a hamper that holds dirty clothes to be washed or wet clothes
       to be dried [syn: clothes hamper, laundry basket,
       clothes basket, voider]