Where does “negatoire” come from?

negatoire (Middle French) comes from Latin negatorius, from Latin negatus, from Latin negō, from Latin nec, from Latin neque, from Proto-Indo-European nekʷe, from Proto-Indo-European ne — not.

Ancestry of “negatoire”, step by step

Step	Language	Word	Meaning
1	Latin	negatorius	negative, negatory; restraining
2	Latin	negatus	denied, having been denied; refused, declined,...
3	Latin	negō	to deny
4	Latin	nec	nor; and not, not; neither
5	Latin	neque	not; and not, also not
6	Proto-Indo-European	nekʷe	and not, neither, nor
7	Proto-Indo-European	ne	not

Every word from Proto-Indo-European ne →Every word from Proto-Indo-European nekʷe →Every word from Latin neque →