anatron

Century Dictionary and Cyclopedia

1. n. Glass-gall or sandiver, a scum which rises upon melted glass in the furnace. It consists of fused salts, chiefly sulphates and chlorids of the alkalis, which have not combined with silica to form glass.
2. n. The salt which collects on the walls of vaults; saltpeter.

Wiktionary

1. n. obsolete native carbonate of soda; natron
2. n. obsolete sandiver
3. n. obsolete saltpetre

GNU Webster's 1913

1. n. Native carbonate of soda; natron.
2. n. Glass gall or sandiver.
3. n. Saltpeter.