English Explanatory Dictionary

actinium

English dictionary entry

Meanings

noun
  1. A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.

Pronunciation

ăktĭn'ēəm /ækˈtɪniəm/ LL-Q1860 (eng)-Vealhurl-actinium.wav LL-Q1860 (eng)-Naomi Persephone Amethyst (NaomiAmethyst)-actinium.wav

Word forms

actinium actiniums

Etymology

Borrowed from French actinium. actin- + -ium.

Related words

actinism actino- actinoid actinon

Derived words

actinate actinide actiniferous actinium A actinium B actinium C actinium emanation actinium fluoride actinium-K actinium series eka-actinium protactinium radioactinium
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