ACTINIUM


Meaning of ACTINIUM in English

n.

Pronunciation: ak- ' ti-n ē - ə m

Function: 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

Merriam Webster Collegiate English Dictionary.      Merriam Webster - Энциклопедический словарь английского языка.