The Collaborative International Dictionary of English v.0.48:

Carapato \Ca`ra*pa"to\ (k[aum]`r[.a]*p[aum]"t[-o]), n. [Pg.
   carrapato.] (Zool.)
   A south American tick of the genus Amblyomma. There are
   several species, very troublesome to man and beast.
   [1913 Webster]