1. thrombin

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

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Example sentences of the word thrombin

1. Noun, singular or mass
Platelets are activated by a substance called thrombin and begin to gather at the site of injury to form a temporary plug.

2. Verb, base form
Several factors in the blood activate prothrombin**, which is then converted to thrombin.