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The following 2 entries include the term willebrand.
von Willebrand disease
noun: a genetic blood disorder marked by prolonged, excessive, or abnormal bleeding that commonly results in recurrent nosebleeds, heavy menstrual flow, and bleeding from the gums, is caused by deficient or defective von Willebrand factor, and typically occurs in a mild form that is less serious than hemophilia
von Willebrand factor
noun: a large glycoprotein clotting factor circulating in blood plasma that mediates platelet adhesion to collagen at sites of vascular injury, that binds to and protects factor VIII from degradation, and that is deficient or defective in individuals affected with von Willebrand disease
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Merriam-Webster unabridged
