noun \ˈga-lē-əm\

Definition of GALLIUM

:  a bluish-white metallic element obtained especially as a by-product in refining various ores and used especially in semiconductors and optoelectronic devices — see element table

Origin of GALLIUM

New Latin, from Latin gallus cock (intended as translation of surname of Paul Lecoq de Boisbaudran †1912 French chemist)
First Known Use: 1875

Rhymes with GALLIUM


noun \ˈgal-ē-əm\   (Medical Dictionary)

Medical Definition of GALLIUM

: a rare bluish white metallic element that is hard and brittle at low temperatures but melts just above room temperature and expands on freezing and that is used in the form of its hydrated nitrate salt Ga(NO3)3·9H2O to treat hypercalcemia caused by certain cancers—symbol Ga; see element table


noun    (Concise Encyclopedia)

Metallic chemical element, chemical symbol Ga, atomic number 31. Silvery white and soft enough to be cut with a knife, gallium has an unusually low melting point (about 30 °C [86 °F]), which allows it to liquefy in the palm of the hand. The liquid metal clings to or wets glass and similar surfaces. Gallium expands on solidification and supercools readily, remaining liquid at temperatures as low as 0 °C (32 °F). In various combinations with aluminum, indium, phosphorus, arsenic, and antimony, it forms compounds (e.g., gallium arsenide and indium gallium arsenide phosphide) with valuable semiconductor and optoelectronic properties; some of these compounds form the basis for such electronic devices as light-emitting diodes and semiconductor lasers.


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