† pterygobranchiateadj. [compare French ptérygibranches, plural noun (1817 or earlier)] ZoologyObsoleterare (of an isopod crustacean) having feather-like gills; cf. phytobranchiateadj. at phyto-comb. form.
ΚΠ
1890 Cent. Dict.Pterygobranchiate, having feathery gills.