n. (also actinoid) Chem. any of the series of 15 radioactive elements having increasing atomic numbers from actinium to lawrencium.
Phrases and idioms:
actinide series this series of elements.
Etymology: ACTINIUM + -IDE as in lanthanide
n. (also actinoid) Chem. any of the series of 15 radioactive elements having increasing atomic numbers from actinium to lawrencium.
Phrases and idioms:
actinide series this series of elements.
Etymology: ACTINIUM + -IDE as in lanthanide
Oxford English vocab. Оксфордский английский словарь. 2012