in·di·um

[in-dee-uhm]
noun Chemistry.
a rare metallic element, soft, white, malleable, and easily fusible, found combined in various ore minerals, especially sphalerite: so called from the two indigo-blue lines in its spectrum. Symbol: In; atomic weight: 114.82; atomic number: 49; specific gravity: 7.3 at 20°C.

Origin:
1860–65; < Neo-Latin, equivalent to ind(icum) indigo + -ium -ium

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indium (ˈɪndɪəm) [Click for IPA pronunciation guide]
 
n
a rare soft silvery metallic element associated with zinc ores: used in alloys, electronics, and electroplating. Symbol: In; atomic no: 49; atomic wt: 114.82; valency: 1, 2, or 3; relative density: 7.31; melting pt: 156.63°C; boiling pt: 2073°C
 
[C19: New Latin, from indigo + -ium]

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00:10
Indium is always a great word to know.
So is ninnyhammer. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
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indium in·di·um (ĭn'dē-əm)
n.
Symbol In
A soft malleable metallic element found primarily in ores of zinc. Atomic number 49; atomic weight 114.82; melting point 156.60°C; boiling point 2,100°C; specific gravity 7.31; valence 1, 2, 3.

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Science Dictionary
indium   (ĭn'dē-əm)  Pronunciation Key 
Symbol In
A soft, malleable, silvery-white metallic element that occurs mainly in ores of zinc and lead. It is used in the manufacture of semiconductors, in bearings for aircraft engines, and as a plating over silver in mirrors. Atomic number 49; atomic weight 114.82; melting point 156.61°C; boiling point 2,080°C; specific gravity 7.31; valence 1, 2, 3. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The same group previously put nano-generators on indium tin oxide electrodes.
It's made of indium phosphide, a semiconductor prized for its optical
  properties.
The best mix they came up with was an alloy of gallium and indium.
Other companies have tried to compete with silicon by using higher-efficiency
  thin-film panels of copper indium gallium selenide.
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