Where does “nontree” come from?

nontree (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.

nontree (English): That which is not a tree

Definitions

That which is not a tree

Ancestry of “nontree”, step by step

nontree 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 tree

Step	Language	Word	Meaning
1	English	tree	A perennial woody plant, not exactly defined, but...
2	Middle English	tre	A tree or a plant that resembles one

Every word from Proto-Indo-European óynos →