sinusoid /ˈsaɪ.nə.sɔɪd/adjective 2noun 2forms 3 adjective2 •Sinusoidal. •Characteristic of a sinus. noun2 •A curve having the shape of a sine wave.Temperature during the week can be represented with a sinusoid. •Any of several channels through which venous blood passes in various organs. formssinusoids · more sinusoid · most sinusoid