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.]

[1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

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.]

Source: Webster's Revised Unabridged Dictionary (1913)