The Collaborative International Dictionary of English v.0.48:

Tatu \Ta*tu"\, n. (Zool.)
   Same as Tatou.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tatu
    n 1: about three feet long exclusive of tail [syn: giant
         armadillo, tatou, tatu, Priodontes giganteus]