Source : Webster's Revised Unabridged Dictionary (1913)

Nereis \Ne"re*is\ (? or ?), n.; pl. {Nereides}. [L.]
   1. (Class. Myth.) A Nereid. See {Nereid}.

   2. (Zo["o]l.) A genus, including numerous species, of marine
      ch[ae]topod annelids, having a well-formed head, with two
      pairs of eyes, antenn[ae], four pairs of tentacles, and a
      protrusile pharynx, armed with a pair of hooked jaws.