Wiktionary
n. (context inorganic compound English) A white, crystalline compound, BeO, used in semiconductors and in specialist ceramic applications.
Wikipedia
Beryllium oxide (BeO), also known as beryllia, is an inorganic compound with the formula BeO. This colourless solid is a notable electrical insulator with a higher thermal conductivity than any other non-metal except diamond, and exceeds that of most metals. As an amorphous solid, beryllium oxide is white. Its high melting point leads to its use as a refractory. It occurs in nature as the mineral bromellite. Historically and in materials science, beryllium oxide was called glucina or glucinium oxide. Formation of BeO from beryllium and oxygen releases the highest energy per mass of reactants for any chemical reaction, close to 24 MJ/kg.
This page provides supplementary chemical data on beryllium oxide.
Usage examples of "beryllium oxide".
It was a smell fusion bomb with a non-critical split mass, reaching the critical factor of one at the time of ignition by utilizing a suitable reflector such as graphite or beryllium oxide.
It became critical with a thick-walled reflector of beryllium oxide.
It had an outer layer of a light grey material which Chellish believed to be beryllium oxide.