Actinium

From TTT

English-Latin

actinium. n.

1. A radioactive element with atomic number 89.
   • NL19 actinium (-ii, neut.)

Latin-English

actīn|ĭum, -ĭī. (akˈti.ni.um) neut.

1. The element actinium.

[Greek ἀκτίς actis "ray". Named by its discoverer André-Louis Debierne in 1900.]