ouistiti

from The Collaborative International Dictionary of English v.0.48

Ouistiti \Ouis"ti*ti\, n. [F.] (Zool.)
   See {Wistit}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Wistit \Wis"tit\, n. [Prob. from native name: cf. F. ouistiti.]
   (Zool.)
   A small South American monkey; a marmoset. [Written also
   {wistiti}, and {ouistiti}.]
   [1913 Webster]