heparin
noun/ˈhɛpərɪn/
Frequency rank: #18,211 most common English word
Meaning
a naturally occurring anticoagulant substance used medically to prevent blood clotting.

Example sentence
After the surgery, the patient was given heparin injections to prevent dangerous blood clots from forming.
Synonyms & related words
- anticoagulant
- blood-thinner
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