Standard Lemma guide

prothrombin

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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1

noun

Meaning 1

A glycoprotein, produced in the liver, that is converted into thrombin during bleeding and subsequent clotting.

Definition source: English Wiktionary via Wiktextract

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

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: clotting factor II, factor II, w:coagulation factor II

Antonyms: none provided

Broader terms: factor, protein

2

noun

Meaning 2

a protein in blood plasma that is the inactive precursor of thrombin

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: factor II

Antonyms: none provided

Broader terms: coagulation factor, clotting factor

History

Etymology

From pro- + thrombin.

Across languages

Translations

7 source translations are retained for this English entry.

  • Catalan: protrombina — glycoprotein
  • French: prothrombine — glycoprotein
  • Galician: protrombina — glycoprotein
  • Italian: protrombina — glycoprotein
  • Portuguese: protrombina — glycoprotein
  • Spanish: protrombina — glycoprotein
  • Swedish: protrombin — glycoprotein