transcription, транскрипция: [ ak-ˈti-nē-əm ]
noun
Etymology: New Latin
Date: 1900
: a radioactive trivalent metallic element that resembles lanthanum in chemical properties and that is found especially in pitchblende — see element table
ACTINIUM
Meaning of ACTINIUM in English
Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003