Source : Webster's Revised Unabridged Dictionary (1913)

Alpaca \Al*pac"a\, n. [Sp. alpaca, fr. the original Peruvian
   name of the animal. Cf. {Paco}.]
   1. (Zo["o]l.) An animal of Peru ({Lama paco}), having long,
      fine, wooly hair, supposed by some to be a domesticated
      variety of the llama.

   2. Wool of the alpaca.

   3. A thin kind of cloth made of the wooly hair of the alpaca,
      often mixed with silk or with cotton.

Source : WordNet®

alpaca
     n 1: wool of the alpaca
     2: a thin glossy fabric made of the wool of the alpaca, or a
        rayon or cotton imitation
     3: domesticated llama with long silky fleece; believed to be a
        domesticated variety of the guanaco [syn: {Lama pacos}]