unicycle /ˈjun.ɪˌsaɪ.kəl/noun 1verb 1adjective 1forms 3 noun1 •A pedal cycle that only has one wheel.A man rode past on a unicycle, laughing. — 2019 verb1 •To travel or move around by unicycle. adjective1 •Synonym of unicyclic. formsunicycled · unicycling · unicycles