Source : Webster's Revised Unabridged Dictionary (1913)

Tuko-tuko \Tu"ko-tu*ko\, n. [From the native name .] (Zo["o]l.)
   A burrowing South American rodent ({Ctenomys Braziliensis}).
   It has small eyes and ears and a short tail. It resembles the
   pocket gopher in size, form, and habits, but is more nearly
   allied to the porcupines. [Written also {tucu-tuco}.]