Lanthanide definition

lanthənīd
Any of a series of 15 naturally occurring metallic elements. The lanthanides include elements having atomic numbers 57 (lanthanum) through 71 (lutetium). They are grouped apart from the rest of the elements in the Periodic Table because they all behave in a similar way in chemical reactions.
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Any of the rare-earth elements (lanthanide series)
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(chemistry) Any of the 14 rare earth elements from cerium (from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides.
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Other Word Forms

Noun

Singular:
lanthanide
Plural:
lanthanides