protium

From proto- +‎ -ium. From Ancient Greek πρῶτος (prôtos, “first”).

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protium (plural protiums)

1. (physics) The lightest and most common isotope of hydrogen, having a single proton and no neutrons: ¹₁H. It is the only stable nuclide with no neutrons.

   So far there are no differences among the protiums extracted at various labs, except for concentration levels.

2. An atom of this isotope.

• hydrogen-one, hydrogen-1, H-1, ¹H
• light hydrogen, normal hydrogen

• hydrogen (H)

• (isotopes of hydrogen): deuterium, tritium, quadrium

• proton (p)

• Elementymology

• protium on Wikipedia.Wikipedia

From Ancient Greek πρῶτος (prôtos) +‎ -ium.

protium n (singular definite protiummet, not used in plural form)

1. protium

   Coordinate terms: deuterium, tritium

From Ancient Greek πρῶτος (prôtos, “first”) +‎ -ium.

• Hyphenation: pro‧ti‧um

protium n (uncountable)

1. protium

From English protium.

• IPA^(key): /ˈprotium/, [ˈpro̞t̪ium]
• Rhymes: -otium
• Syllabification^(key): pro‧ti‧um
• Hyphenation^(key): pro‧ti‧um

protium

1. (physics) protium

• “protium”, 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 3 July 2023

• (Classical Latin) IPA^(key): [ˈproː.ti.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈprɔt̪.t̪͡s̪i.um]

prōtium n (genitive prōtiī or prōtī); second declension

1. protium

Second-declension noun (neuter).

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