coronary UK /ˈkɒɹən(ə)ɹi/US /ˈkɔɹənɛɹi/adjective 2noun 3forms 3 adjective2 •Encircling something (like a crown), especially with regard to the arteries or veins of the heart. •(no longer used) Pertaining to a crown or garland.The catalogue of coronary plants is not large in Theophrastus. — 1684 noun3 •Any of the coronary vessels; a coronary artery or coronary vein. •Ellipsis of coronary thrombosis.Manny had a coronary last week, followed by a triple bypass. •A small bone in the foot of a horse. formscoronaries · more coronary · most coronary