anatron

from The Century Dictionary.

• noun Glass-gall or sandiver, a scum which rises upon melted glass in the furnace.
• noun The salt which collects on the walls of vaults; saltpeter.

from the GNU version of the Collaborative International Dictionary of English.

• noun Native carbonate of soda; natron.
• noun Glass gall or sandiver.
• noun Saltpeter.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete native carbonate of soda; natron
• noun obsolete sandiver
• noun obsolete saltpetre