Where does “nongrain” come from?

nongrain (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.

nongrain (English): That which is not grain; a food product not...

Definitions

That which is not grain; a food product not...

Ancestry of “nongrain”, step by step

nongrain 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 grain

Step	Language	Word	Meaning
1	English	grain	The harvested seeds of various grass food crops...
2	Middle English	grayn	A forking channel or pass; a fjord or estuary;...
3	Old Norse	grein	branch; point, head, part; cause, reason
4	Proto-Germanic	grainō	—

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