n. (also actinoid) Chem. any of the series of 15 radioactive elements having increasing atomic numbers from actinium to lawrencium. øactinide series this series of elements. [ACTINIUM + -IDE as in lanthanide]
ACTINIDE
Meaning of ACTINIDE in English
English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012