Where does “nonkeratin” come from?

nonkeratin (English) comes from English non, from French non, from Old French non, from Latin nōn, from Old Latin noenum, from Proto-Indo-European óynos — one; single.

nonkeratin (English): That which is not keratin

Definitions

That which is not keratin

Ancestry of “nonkeratin”, step by step

nonkeratin traces back through two separate lines of ancestry.

via English non

Step	Language	Word	Meaning
1	English	non	Obsolete form of none
2	French	non	no; not; a no, a negative response
3	Old French	non	no; not; Alternative form of nom
4	Latin	nōn	not
5	Old Latin	noenum	—
6	Proto-Indo-European	óynos	one; single

via English keratin

Step	Language	Word	Meaning
1	English	keratin	The protein of which hair and nails are composed
2	German	Keratin	Keratin (protein that hair and nails are made of)
3	Ancient Greek	κέρας	horn; horn as a material, or anything made of...
4	Proto-Hellenic	*kérats	—

Every word from Proto-Indo-European óynos →Every word from Old Latin noenum →Every word from Latin nōn →