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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)