The Collaborative International Dictionary of English v.0.48:

Carpet \Car"pet\ (k[aum]r"p[e^]t), n. [OF. carpite rug, soft of
   cloth, F. carpette coarse packing cloth, rug (cf. It. carpita
   rug, blanket), LL. carpeta, carpita, woolly cloths, fr. L.
   carpere to pluck, to card (wool); cf. Gr. karpo`s fruit, E.
   Harvest.]
   1. A heavy woven or felted fabric, usually of wool, but also
      of cotton, hemp, straw, etc.; esp. a floor covering made
      in breadths to be sewed together and nailed to the floor,
      as distinguished from a rug or mat; originally, also, a
      wrought cover for tables.
      [1913 Webster]

            Tables and beds covered with copes instead of
            carpets and coverlets.                --T. Fuller.
      [1913 Webster]

   2. A smooth soft covering resembling or suggesting a carpet.
      "The grassy carpet of this plain." --Shak.
      [1913 Webster]

   Carpet beetle or Carpet bug (Zool.), a small beetle
      (Anthrenus scrophulari[ae]), which, in the larval state,
      does great damage to carpets and other woolen goods; --
      also called buffalo bug.

   Carpet knight.
      (a) A knight who enjoys ease and security, or luxury, and
          has not known the hardships of the field; a hero of
          the drawing room; an effeminate person. --Shak.
      (b) One made a knight, for some other than military
          distinction or service.

   Carpet moth (Zool.), the larva of an insect which feeds on
      carpets and other woolen goods. There are several kinds.
      Some are the larv[ae] of species of Tinea (as Tinea
      tapetzella); others of beetles, esp. Anthrenus.

   Carpet snake (Zool.), an Australian snake. See Diamond
      snake, under Diamond.

   Carpet sweeper, an apparatus or device for sweeping
      carpets.

   To be on the carpet, to be under consideration; to be the
      subject of deliberation; to be in sight; -- an expression
      derived from the use of carpets as table cover.

   Brussels carpet. See under Brussels.
      [1913 Webster]

WordNet (r) 3.0 (2006):

carpet bug
    n 1: small beetle whose larvae are household pests feeding on
         woolen fabrics [syn: carpet beetle, carpet bug]