keratinous

• from keratin +‎ -ous

keratinous (comparative more keratinous, superlative most keratinous)

1. Consisting of, or made from keratin.

   Synonym: keratinaceous

   • 2001 March 9, Richard O. Prum et al., “Longisquama Fossil and Feather Morphology”, in Science‎, volume 291, number 5510, →DOI, pages 1899–1902:

     Prum implies that, whatever their morphology, Longisquama’s appendages were not keratinous, whereas in fact, all amniote epidermal appendages consist of keratin ( 2 ).

• ketonurias