The Collaborative International Dictionary of English v.0.48:

Vicuna \Vi*cu"[~n]a\, Vicugna \Vi*cu"gna\, n. [Sp. vicu[~n]a.
   Cf. Vigonia.] (Zool.)
   A South American mammal (Auchenia vicunna) native of the
   elevated plains of the Andes, allied to the llama but
   smaller. It has a thick coat of very fine reddish brown wool,
   and long, pendent white hair on the breast and belly. It is
   hunted for its wool and flesh.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vicuna
    n 1: the wool of the vicuna
    2: a soft wool fabric made from the fleece of the vicuna
    3: small wild cud-chewing Andean animal similar to the guanaco
       but smaller; valued for its fleecy undercoat [syn: vicuna,
       Vicugna vicugna]