The Collaborative International Dictionary of English v.0.48:
Coronary thrombosis \Cor"o*na*ry throm*bo"sis\, n. the blockage of the coronary artery of the heart by a thrombus. [PJC] CoronateWordNet (r) 3.0 (2006):
coronary thrombosis n 1: obstruction of blood flow in a coronary artery by a blood clot (thrombus) [syn: coronary thrombosis, coronary]