: a silvery malleable fusible chiefly trivalent metallic element that occurs especially in sphalerite ores and is used especially as a plating material, in alloys, and in electronics see Chemical Elements Table
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Among its discoveries are a massive underground trove of nickel and palladium on Australia’s east coast, and a deposit of indium, a rare-earth metal critical for AI semiconductors, also in Australia.
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New Atlas, 8 May 2026
Vector Photonics has developed PCSELs made of indium phosphide and indium gallium arsenide phosphide that a commercial fab could reproduce and manufacture reliably.
—IEEE Spectrum, 7 May 2026
The researchers successfully applied their strategy to a variety of electrolytes — including those based on zirconium, indium, yttrium, and erbium — achieving consistent results across the board.
—Mrigakshi Dixit, Interesting Engineering, 17 Apr. 2026
Intertek reportedly tested the optical sheet, diffuser plate, and LED modules in each TV using a minimum detection standard of 0.5 mg/kg for cadmium and 2 mg/kg for indium.
—Scharon Harding, ArsTechnica, 19 Mar. 2026
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New Atlas, 8 May 2026
Vector Photonics has developed PCSELs made of indium phosphide and indium gallium arsenide phosphide that a commercial fab could reproduce and manufacture reliably.
—IEEE Spectrum, 7 May 2026
The researchers successfully applied their strategy to a variety of electrolytes — including those based on zirconium, indium, yttrium, and erbium — achieving consistent results across the board.
—Mrigakshi Dixit, Interesting Engineering, 17 Apr. 2026
Intertek reportedly tested the optical sheet, diffuser plate, and LED modules in each TV using a minimum detection standard of 0.5 mg/kg for cadmium and 2 mg/kg for indium.
—Scharon Harding, ArsTechnica, 19 Mar. 2026
See All Example Sentences for indium
Cite this Entry
“Indium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indium. Accessed 21 May. 2026.
Copy CitationMedical Definition
indium
noun
in·di·um
ˈin-dē-əm 
: a malleable fusible silvery metallic element that is chiefly trivalent, occurs especially in sphalerite ores, and is used as a plating for bearings, in alloys having a low melting point, and in making transistors
—symbol In
see Chemical Elements Table
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