anticoagulant
noun/ˌæntikəʊˈæɡjələnt/
/ˌæntikəʊˈæɡjələnt/, /ˌæntaɪkəʊˈæɡjələnt/
(medical)- a substance that stops the blood from becoming thick and forming clots
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anticoagulant
Definition of anticoagulant noun from the Oxford Advanced Learner's Dictionary