Definify.com

Webster 1913 Edition


Lanthanum

Lan′tha-num

(lăn′thȧ-nŭm)
,
Noun.
[NL., fr. Gr.
λανθάνειν
to lie hid, to be concealed.]
(Chem.)
A rare element of the rare earth group of the metals, of atomic number 57, allied to aluminum. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare earth elements with which it is usually associated. Atomic weight 138.9. Symbol La.
[Formerly written also
lanthanium
.]

Definition 2024


lanthanum

lanthanum

English

Chemical element
La Previous: barium (Ba)
Next: cerium (Ce)

Alternative forms

Noun

lanthanum (countable and uncountable, plural lanthanums)

  1. (uncountable) A metallic chemical element (symbol La) with an atomic number of 57.
  2. (countable) An atom of this element.

Related terms

Derived terms

Translations

See also


Latin

Pronunciation

  • (Classical) IPA(key): /ˈlan.tʰa.num/, [ˈɫan.tʰa.nũ]

Noun

lanthanum n (genitive lanthanī); second declension

  1. lanthanum

Inflection

Second declension.

Case Singular Plural
nominative lanthanum lanthana
genitive lanthanī lanthanōrum
dative lanthanō lanthanīs
accusative lanthanum lanthana
ablative lanthanō lanthanīs
vocative lanthanum lanthana

Limburgish

Pronunciation

  • IPA(key): [lɑ˧nˈðaː˨nɔ˧m]

Noun

lanthanum n

  1. (uncountable) lanthanum
  2. A part of lanthanum

Inflection