(inorganic chemistry) Lithium oxide, Li₂O, used in the manufacture of ceramics and glass.
1839, Lithium, entry in The Penny Cyclopædia of the Society for the Diffusion of Useful Knowledge, Volume 14, page 43,
These substances contain from about five to nearly ten per cent. of lithia in combination with silica, from which it is best separated by the following process of Berzelius: […] .
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