Also found in: Dictionary, Thesaurus, Encyclopedia.
an unattached, spherical antemortem thrombus found in the left or right atrium usually in certain cases of mitral stenosis.
a relatively round, coagulated mass of blood, containing platelets, fibrin, and cellular fragments, that may obstruct a blood vessel or an orifice, usually the mitral valve of the heart.
A round thrombus in the heart, esp. in the atria.
See also: thrombus