What does "lanthanide" mean?

Any of the 15 rare earth elements from lanthanum to lutetium in the periodic table; because their outermost orbitals are not filled, they have very similar chemistry; below them are the actinides.

How do you pronounce "lanthanide"?

Pronounced //ˈlænθənaɪd//.

Lanthanide

Q: What is a synonym for "lanthanide"?

Common synonyms include: lanthanoid, lanthanon, rare-earth element, lanthanate, lanthanate, lanthanoid.

//ˈlænθənaɪd// noun

noun ·Uncommon ·Advanced level

Definitions

Noun

1
Any of the 15 rare earth elements from lanthanum to lutetium in the periodic table; because their outermost orbitals are not filled, they have very similar chemistry; below them are the actinides.
2
any element of the lanthanide series (atomic numbers 57 through 71) wordnet
3
Any of the 14 rare earth elements from lanthanum to ytterbium (lutetium is excluded by some authors as it is a d-block rather than an f-block element).
4
Any of the 14 rare earth elements from cerium to lutetium (lanthanum having been excluded because it was thought to be a d-block element in the past). dated