gallium

[gal-ee-uhm]
noun Chemistry.
a rare, steel-gray, trivalent metallic element used in high-temperature thermometers because of its high boiling point (1983°C) and low melting point (30°C). Symbol: Ga; atomic weight: 69.72; atomic number: 31; specific gravity: 5.91 at 20°C.

Origin:
1870–75; < Neo-Latin, equivalent to Latin gall(us) cock (translation of French coq, from Lecoq de Boisbaudran, 19th-century French chemist) + Neo-Latin -ium -ium

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World English Dictionary
gallium (ˈɡælɪəm)
 
n
a silvery metallic element that is liquid for a wide temperature range. It occurs in trace amounts in some ores and is used in high-temperature thermometers and low-melting alloys. Gallium arsenide is a semiconductor. Symbol: Ga; atomic no: 31; atomic wt: 69.723; valency: 2 or 3; relative density: 5.904; melting pt: 29.77°C; boiling pt: 2205°C
 
[C19: from New Latin, from Latin gallus cock, translation of French coq in the name of its discoverer, Lecoq de Boisbaudran, 19th-century French chemist]

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Medical Dictionary

gallium gal·li·um (gāl'ē-əm)
n.
Symbol Ga
A rare metallic element that is liquid near room temperature and is found as a trace element in coal, bauxite, and other minerals. Atomic number 31; atomic weight 69.72; melting point 29.76°C; boiling point 2,204°C; specific gravity 5.904; valence 2, 3.

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Science Dictionary
gallium   (gāl'ē-əm)  Pronunciation Key 
Symbol Ga
A rare, silvery metallic element that is found as a trace element in coal, in bauxite, and in several minerals. It is liquid near room temperature and expands when it solidifies. It is used in thermometers and semiconductors. Atomic number 31; atomic weight 69.72; melting point 29.78°C; boiling point 2,403°C; specific gravity 5.907; valence 2, 3. See Periodic Table.
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Example sentences
The best mix they came up with was an alloy of gallium and indium.
Gallium nitride had long been written off as fatally flawed.
Similarly, adding nitrogen to a semiconductor such as gallium arsenide
  phosphide will also give a multi-band semiconductor.
One involved depositing gallium arsenide on a rigid surface, then peeling it
  off to make a flexible solar cell.
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