The Collaborative International Dictionary
Saltpetrous
Saltpetrous \Salt`pe"trous\, a. [Cf. F. salp[^e]treux.] Pertaining to saltpeter, or partaking of its qualities; impregnated with saltpeter. [Obs.]
Wiktionary
saltpetrous
a. (context obsolete English) Of or pertaining to saltpetre.