sinusoidal /ˌsaɪnəˈsɔɪdəl/adjective 2noun 1forms 3 adjective2 •Having the shape or characteristics of a sine wave. •Relating to any of several channels (the sinusoids) through which venous blood passes in various organs. noun1 •A sine wave (or combination of such waves) formssinusoidals · more sinusoidal · most sinusoidal