Where does “nitre” come from?

nitre (Old French) comes from Latin nitrum, from Ancient Greek νίτρον, from Egyptian nṯrj, from Egyptian -j, from Egyptian -t, from Proto-Afro-Asiatic -t.

Ancestry of “nitre”, step by step

Step	Language	Word	Meaning
1	Latin	nitrum	Various alkalis
2	Ancient Greek	νίτρον	sodium carbonate
3	Egyptian	nṯrj	to be divine; to make divine; divine, holy
4	Egyptian	-j	Marks the dual form of nouns and adjectives....
5	Egyptian	-t	Used to form feminine singular forms of nouns; An...
6	Proto-Afro-Asiatic	-t	—

Words derived from “nitre”

niter
niter
nitere
nitre
nytre

Every word from Proto-Afro-Asiatic -t →Every word from Egyptian -t →Every word from Egyptian -j →