tri·cy·cle 
/ˈtraɪsəkəl/ noun
plural tri·cy·cles /ˈtraɪsəkəl/ noun [count] : a three-wheeled vehicle that a person rides by pushing on foot pedals ◊Tricycles are usually ridden by young children.
▪ He likes to ride his tricycle. [=(informal) trike] — compare bicycle, unicycle
▪ He likes to ride his tricycle. [=(informal) trike] — compare bicycle, unicycle
