tricuspid /tɹaɪˈkʌspɪd/adjective 2noun 1forms 3 adjective2 •Having three cusps, e.g. a molar tooth •Describing the valve, between the right atrium and ventricle of the heart, that has three triangular segments noun1 •A molar tooth that has three cusps formstricuspids · more tricuspid · most tricuspid