lanthanide.

English - English

Definition of lanthanide. in English English dictionary

lanthanoid

Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides

Any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57-71). With scandium and yttrium, they make up the rare earth metals. Their atoms have similar configurations and similar physical and chemical behaviour; the most common valences are 3 and 4

Hyphenation

lan·tha·nide