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iridium.

(uncountable) A chemical element with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group.

7 characters3 syllables approx.English language

Meaning & usage

noun/ɪˈɹɪd.i.əm/
  1. (uncountable) A chemical element with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group.

    countable · uncountable
  2. (uncountable) A chemical element with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group. An atom of this element.

    countable
Where this word comes from

From international scientific vocabulary, from New Latin iridium, from Classical Latin iris + -ium, from Ancient Greek ἶρις (îris, “rainbow”), because of the bright colour of many of the element's salts.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.