Webster's Online Dictionary
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Definition: IRIDOSMIUM

Part of Speech Definition
Noun 1. The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Iridosmium" was first used in popular English literature: sometime before 1914. (references)

Definition: IRIDOSMIUM

Part of SpeechDefinition
Noun1. The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "IRIDOSMIUM" was first used in popular English literature: sometime before 1914. (references)