also: アクチニド · アクチナイド
noun, noun-modifying (irregular)
actinide; actinoid
Chemistry term for the series of elements from actinium to lawrencium. Used as a noun or prenominally.
ウランはアクチノイドに属する元素です。
Uranium is an element belonging to the actinides.
アクチノイド系列の元素はすべて放
All elements in the actinide series are radioactive.