Source : Webster's Revised Unabridged Dictionary (1913)

Nakoo \Na"koo\, n. [From the native name.] (Zo["o]l.)
   The gavial. [Written also {nako}.]

Gavial \Ga"vi*al\, n. [Hind. ghariu?l: cf. F. gavial.]
   (Zo["o]l.)
   A large Asiatic crocodilian ({Gavialis Gangeticus}); --
   called also {nako}, and {Gangetic crocodile}.

   Note: The gavial has a long, slender muzzle, teeth of nearly
         uniform size, and feet completely webbed. It inhabits
         the Ganges and other rivers of India. The name is also
         applied to several allied fossil species.