a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
actinide series in American English
noun
Chemistry
the series of radioactive elements that starts with actinium and ends with lawrencium
Word origin
[1940–45]This word is first recorded in the period 1940–45. Other words that entered Englishat around the same time include: airlift, debrief, snorkel, whiteout, zap
Examples of 'actinide series' in a sentence
actinide series
Which element, the final member of the actinide series, is named after the inventor of the cyclotron?