Source : Webster's Revised Unabridged Dictionary (1913)

Pleuronectoid \Pleu`ro*nec"toid\, a. [NL. Pleuronectes, name of
   a genus (fr. Gr. ? rib + ? a swimmer) + -oid.] (Zo["o]l.)
   Pertaining to the {Pleuronectid[ae]}, or Flounder family.