The Collaborative International Dictionary
sandever
Sandiver \San"di*ver\, n. [Perh. fr. OF. sa["i]n grease, fat + de of + verre glass (cf. Saim), or fr. F. sel de verre sandiver.] A whitish substance which is cast up, as a scum, from the materials of glass in fusion, and, floating on the top, is skimmed off; -- called also glass gall. [Formerly written also sandever.]
Wiktionary
sandever
n. (alternative form of sandiver English)