Source : Webster's Revised Unabridged Dictionary (1913)

Paragnathus \Pa*rag"na*thus\, n.; pl. {Paragnathi}. [NL. See
   {Para-}, and {Gnathic}.] (Zo["o]l.)
   (a) One of the two lobes which form the lower lip, or
       metastome, of Crustacea.
   (b) One of the small, horny, toothlike jaws of certain
       annelids.