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osmiridium

[oz-muh-rid-ee-uh m] /ˌɒz məˈrɪd i əm/
noun, Chemistry.
Origin of osmiridium
1875-1880
From German, dating back to 1875-80; See origin at osmium, iridium
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for osmiridium

osmiridium

/ˌɒzmɪˈrɪdɪəm/
noun
1.
a very hard corrosion-resistant white or grey natural alloy of osmium and iridium in variable proportions, often containing smaller amounts of platinum, ruthenium, and rhodium: used esp in pen nibs Also iridosmine
Word Origin
C19: from osm(ium) + iridium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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18
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