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
- lantanium (obsolete)
- lanthanium (obsolete)
Noun
lanthanum (countable and uncountable, plural lanthanums)
- (uncountable) A metallic chemical element (symbol La) with an atomic number of 57.
- (countable) An atom of this element.
Related terms
terms related to lanthanum
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Derived terms
terms derived from lanthanum
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Translations
metallic element
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See also
- Fosrenol
- rare earth
Latin
Pronunciation
- (Classical) IPA(key): /ˈlan.tʰa.num/, [ˈɫan.tʰa.nũ]
Noun
lanthanum n (genitive lanthanī); second declension
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
Inflection
Declension of lanthanum
| Root singular | Root plural | Diminutive singular | Diminutive plural | |
|---|---|---|---|---|
| Nominative | lanthanum | lanthana | lanthaneke | lanthanekes |
| Genitive | lanthanums | lanthana | lanthanekes | lanthanekes |
| Locative | lanthaneës | lanthaneëser | lanthaneëske | lanthaneëskes |
| Dative¹ | lanthanumme | — | lanthaneke | — |
| Accusative¹ | lanthanum | — | lanthaneke | — |
| ¹Dative and accusative are nowadays obsolete, the nominative is used instead. | ||||