Etymology
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iridium (n.)

silver-white metallic element, 1804, coined in Modern Latin by its discoverer, English chemist Smithson Tennant (1761-1815) from Greek iris (genitive iridos) "rainbow" (see iris) + chemical ending -ium. So called "from the striking variety of colours which it gives while dissolving in marine acid" [Tennant]

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Definitions of iridium

iridium (n.)
a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium;
Synonyms: Ir / atomic number "
From wordnet.princeton.edu