\An"a*tron\, n. [F. anatron, natron, Sp. anatron,
natron, fr. Ar. al-natr[=u]n. See {Natron}, {Niter}.] [Obs.]
1. Native carbonate of soda; natron.
2. Glass gall or sandiver.
3. Saltpeter. --Coxe. --Johnson.