niter
noun
ni·ter ˈnī-tər 
1
: potassium nitrate
2
archaic : chile saltpeter
Word History
Etymology
Middle English nitre natron, from Middle French, from Latin nitrum, from Greek nitron, from Egyptian nṯry
First Known Use
1577, in the meaning defined at sense 1
Medical Definition
niter
noun
ni·ter
variants or chiefly British nitre
ˈnīt-ər
1
: potassium nitrate
2
archaic : chile saltpeter