Definition of "keratinous"
adjective
comparative more keratinous, superlative most keratinous
Consisting of, or made from keratin.
Quotations
Prum implies that, whatever their morphology, Longisquama’s appendages were not keratinous, whereas in fact, all amniote epidermal appendages consist of keratin ( 2 ).
2001 March 9, Richard O. Prum et al., “Longisquama Fossil and Feather Morphology”, in Science, volume 291, number 5510, pages 1899–1902