plecoglossid noun1 •Any fish of the family Plecoglossidae (sometimes regarded as a subfamily, Plecoglossinae in Osmeridae); the ayu or sweetfish.Families included here include prototroctids, most diadromous galaxiids, a plecoglossid, mugiloidid, and some eleotrids and gobiids. — 1988 formsplecoglossids
