Pronunciation: (trī'si-kul, -sik"ul), [key]
1. a vehicle, esp. one for children, having one large front wheel and two small rear wheels, propelled by foot pedals.
2. a velocipede with three wheels propelled by pedals or hand levers.
3. a three-wheeled motorcycle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.