noun Etymology: International Scientific Vocabulary Date: circa 1849 any of various sulfur-containing fibrous proteins that form the chemical basis of horny epidermal tissues (as hair and nails), ~ous adjective
KERATIN
Meaning of KERATIN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012