Standard Lemma guide

thrombin

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.

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Pronunciation

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  • /ˈθɹɒmbɪn/

1

noun

Meaning 1

An enzyme in blood that facilitates blood clotting by converting fibrinogen to fibrin (by means of ionized calcium).

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: factor II

Antonyms: none provided

2

noun

Meaning 2

an enzyme that acts on fibrinogen in blood causing it to clot

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: coagulase

History

Etymology

From thromb- + -in.