Radioactinium

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The radioactive isotope of actinium, ²²⁷₈₉Ac, having a half-life of 21.7 years uncountable

Synonyms

All synonyms
actinium 227actinium-227thorium 227

Etymology

From radio- + actinium.

Related phrases

half life

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.