The Collaborative International Dictionary
anatron
Natron \Na"tron\, n. [F., fr. Sp. natron, Ar. natr[=u]n, nitr[=u]n. Cf. Niter, Anatron.] (Min.) Native sodium carbonate. [Written also anatron.]
Wiktionary
anatron
n. 1 (context obsolete English) native carbonate of soda; natron 2 (context obsolete English) sandiver 3 (context obsolete English) saltpetre