† pygobranchiousadj. [ < pygo-comb. form + ancient Greek βράγχια gills (see branchiaen.) + -oussuffix, after scientific Latin Pygobranchia (see pygobranchiateadj.)] ZoologyObsoleterare = pygobranchiateadj.Apparently only attested in dictionaries or glossaries.
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1858 R. G. MayneExpos. Lexicon Med. Sci. (1860) 1048/1Pygobranchius,..applied by Gray to an order (Pygobranchia) of the Gasteropodophora..; pygobranchious.