Standard Lemma guide

protium

noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • UK: /ˈpɹəʊ.tiəm/
  • US: /ˈpɹoʊ.tiəm/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -əʊtiəm
  • CMU ARPABET: P R OW1 T IY0 AH0 M Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

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.

Definition source: English Wiktionary via Wiktextract

Topics: natural-sciences, physical-sciences, physics

Examples

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

Meaning relationships

Synonyms: mul:H-1, mul:1H, hydrogen, hydrogen-1, hydrogen 1, light hydrogen, normal hydrogen

Antonyms: none provided

Broader terms: hydrogen, mul:H

2

noun

Meaning 2

An atom of this isotope.

Definition source: English Wiktionary via Wiktextract

Examples

  • This radioactive decay leaves behind a protium as well.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

genus of chiefly tropical American trees having fragrant wood and yielding gum elemi

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: genus Protium

Antonyms: none provided

Broader terms: rosid dicot genus

History

Etymology

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

Across languages

Translations

21 source translations are retained for this English entry.

  • Afrikaans: protium — lightest isotope of hydrogen
  • Bulgarian: про́тий (prótij) — lightest isotope of hydrogen
  • Catalan: proti — lightest isotope of hydrogen
  • Chinese Mandarin: 氕 (piē) — lightest isotope of hydrogen
  • Dutch: protium — lightest isotope of hydrogen
  • Esperanto: procio — lightest isotope of hydrogen
  • Finnish: protium — lightest isotope of hydrogen
  • French: protium — lightest isotope of hydrogen
  • German: Protium — lightest isotope of hydrogen
  • Hungarian: prócium — lightest isotope of hydrogen
  • Icelandic: einvetni — lightest isotope of hydrogen
  • Icelandic: prótín — lightest isotope of hydrogen
  • Ido: protio — lightest isotope of hydrogen
  • Italian: prozio — lightest isotope of hydrogen
  • Japanese: 軽水素 (keisuiso) — lightest isotope of hydrogen
  • Japanese: プロチウム (purochiumu) — lightest isotope of hydrogen
  • Korean: 프로튬 (peurotyum) — lightest isotope of hydrogen
  • Polish: prot — lightest isotope of hydrogen
  • Portuguese: prótio — lightest isotope of hydrogen
  • Russian: про́тий (prótij) — lightest isotope of hydrogen
  • Spanish: protio — lightest isotope of hydrogen