actinium.
actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores)
Meaning & usage
actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores)
Where this word comes from
First part actin- from Ancient Greek ἀκτίς (aktís, “ray, beam”), from Proto-Hellenic [Term?], from Proto-Indo-European *nókʷ-t-u-s ~ *n̥kʷ-t-éw-s, from *nókʷts (“night”), from *negʷ- (“bare, naked”). Last part from Latin -ium (forms names of chemical elements), from -ius (forms adjectives).
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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.