deuterium

From deutero- +‎ -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”).

• (UK) IPA^(key): /djuːˈtɪəɹɪəm/, /dʒuːˈtɪəɹɪəm/

• Audio (Southern England):

  (file)

• (US) IPA^(key): /djuːˈtɪɹi.əm/
• Hyphenation: deu‧te‧ri‧um
• Rhymes: -ɪəɹiəm

deuterium (countable and uncountable, plural deuteriums)

1. (uncountable, physics) An isotope of hydrogen with one proton and one neutron in each atom - ²₁H.

   Heavy water is "heavy" because it contains deuterium.

2. (countable) An atom of this isotope.

   There were about 80 deuteriums for every million protiums, and virtually no tritium.

IUPAC recommends that the chemical symbol for deuterium should be ²H, rather than D;^[1] to prevent problems in alphabetical sorting of formulae. Likewise, tritium should be called ³H, rather than T.

• heavy hydrogen
• (chemical symbol): ²H, (or less correctly) D

• hydrogen

• (isotopes of hydrogen): protium, tritium, quadrium
• (other named isotopes): diproton, thoron

• deuteron

Natural hydrogen on Earth is about 150 parts per million deuterium, by number of atoms.

• heavy water

• Elementymology

• IPA^(key): [ˈdɛu̯tɛːrɪjum]

deuterium n

1. deuterium (isotope of hydrogen)

From Ancient Greek δεύτερος (deúteros) +‎ -ium.

deuterium n (singular definite deuteriummet, not used in plural form)

1. deuterium

   Coordinate terms: protium, tritium

Borrowed from English deuterium. Coined by Harold Urey, an American chemist, from Ancient Greek δεύτερος (deúteros, “second”) + -ium.

• IPA^(key): /ˌdœy̯ˈteː.ri.ʏm/

• Audio:

  (file)

• Hyphenation: deu‧te‧ri‧um
• Rhymes: -eːriʏm

deuterium n (uncountable)

1. deuterium

• deuteriumkern

Internationalism (see English deuterium).

• IPA^(key): /ˈdeu̯terium/, [ˈde̞u̯t̪e̞ˌrium]
• Rhymes: -ium
• Syllabification^(key): deu‧te‧ri‧um
• Hyphenation^(key): deu‧te‧ri‧um

deuterium

1. (physics) deuterium

• “deuterium”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎^[1] (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2 July 2023

deuterium n (genitive deuteriī or deuterī); second declension

1. deuterium

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

From English hydrogen, from Ancient Greek δεύτερος (deúteros, “second”) + -ium.

• IPA^(key): [deutəriom], [deutəriəm], [diutəriəm]
• Rhymes: -iom, -jom, -om

deuterium

1. (physics) deuterium (isotope of hydrogen)