The Collaborative International Dictionary
Pleuronectoid
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.
Wiktionary
pleuronectoid
a. (context zoology English) Relating to the Pleuronectidae, or flounder family.