Didymium

[di'dimjәm]

Definition

(n.) A rare metallic substance usually associated with the metal cerium; -- hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances, neodymium and praseodymium. See Neodymium, and Praseodymium.

Checked by Basil

Definition

n. a supposed element discovered in 1841 so named from being as it were twin brother of lanthamum.

Typed by Harley