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1827, in the meaning defined above
borrowed from German Iridosmin, from Iridium iridium + Osmium osmium + -in -ine entry 2
Named by the German mineralogist August Breithaupt (1791-1873) in "Mineralogische Untersuchung des russischen Platinsandes," Annalen der Physik, Band 84 (1826), pp. 500-05.
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Conjugating an irregular verb
It relates to godfathers.
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