Source : Webster's Revised Unabridged Dictionary (1913)

Cestraciont \Ces*tra"ci*ont\, n. [Gr. ? a kind of fish.]
   (Zo["o]l.)
   A shark of the genus {Cestracion}, and of related genera. The
   posterior teeth form a pavement of bony plates for crushing
   shellfish. Most of the species are extinct. The Port Jackson
   shark and a similar one found in California are living
   examples.

Cestraciont \Ces*tra"ci*ont\, a. (Zo["o]l.)
   Pertaining to, or characteristic of, the genus {Cestracion}.