The Collaborative International Dictionary of English v.0.48:

Poyou \Poy"ou\, n. (Zool.)
   A South American armadillo (Dasypus sexcinctus). Called
   also sixbanded armadillo.
   [1913 Webster]

WordNet (r) 3.0 (2006):

poyou
    n 1: Argentine armadillo with six movable bands and hairy
         underparts [syn: peludo, poyou, Euphractus
         sexcinctus]