noun🔗ShareAktinidAny of the 14 radioactive elements of the periodic table that are positioned under the lanthanides, to which they have similar chemistry."Uranium, an actinide, is a heavy metal used in some power plants. "Uran, ein Aktinid, ist ein Schwermetall, das in einigen Kraftwerken verwendet wird.elementchemistryscienceChat with AIVocabulary GamePractice Reading
