About The Word Iridium
Learn about the word Iridium to help solve your crossword puzzle. Discover Iridium definitions and meaning, origins, synonyms, related terms and more at the free Crossword Dictionary.
Iridium
| Iridium Definition And Meaning |
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What's The Definition Of Iridium?
[n] a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
Synonyms | Synonyms for Iridium: atomic number 77 | Ir Related Terms | Find terms related to Iridium: See Also | metal | metallic element Iridium In Webster's Dictionary \I*rid"i*um\, n. [NL., fr. L. iris, iridis, the rainbow.
So called from the iridescence of some of its solutions. See
{Iris}.] (Chem.)
A rare metallic element, of the same group as platinum, which
it much resembles, being silver-white, but harder, and
brittle, and indifferent to most corrosive agents. With the
exception of osmium, it is the heaviest substance known, its
specific gravity being 22.4. Symbol Ir. Atomic weight 192.5.
Note: Iridium usually occurs as a native alloy with osmium
(iridosmine or osmiridium), which may occur alone or
with platinum. Iridium, as an alloy with platinum, is
used in bushing the vents of heavy ordnance. It is also
used for the points of gold pens, and in a finely
powdered condition (iridium black), for painting
porcelain black.
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