Skip to Content


Pronunciation: mit-ner'e-um

Definition: An artificial transplutonium element; atomic number 109; atomic weight 266. [Formerly called Unnilennium, Une.]

[Lise Meitner, Austrian-Swedish physicist, 1878–1968]

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.