Standard Lemma guide

threonine

noun · 2 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

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  • /ˈθɹiːəniːn/
  • UK: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

An essential amino acid C4H9NO3 found in most animal proteins.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: biochemistry, biology, chemistry, microbiology, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a colorless crystalline amino acid found in protein; occurs in the hydrolysates of certain proteins; an essential component of human nutrition

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: essential amino acid

History

Etymology

From threose.

Across languages

Translations

18 source translations are retained for this English entry.

  • Bulgarian: треонин (treonin) — an essential amino acid
  • Catalan: treonina — an essential amino acid
  • Chinese Mandarin: 蘇氨酸 /苏氨酸 (sū'ānsuān) — an essential amino acid
  • Czech: threonin — an essential amino acid
  • Esperanto: treonino — an essential amino acid
  • Finnish: treoniini — an essential amino acid
  • French: thréonine — an essential amino acid
  • Galician: treonina — an essential amino acid
  • German: Threonin — an essential amino acid
  • Greek: θρεονίνη (threoníni) — an essential amino acid
  • Hungarian: treonin — an essential amino acid
  • Italian: treonina — an essential amino acid
  • Japanese: トレオニン (toreonin) — an essential amino acid
  • Polish: treonina — an essential amino acid
  • Portuguese: treonina — an essential amino acid
  • Russian: треони́н (treonín) — an essential amino acid
  • Spanish: treonina — an essential amino acid
  • Swedish: treonin — an essential amino acid