noun
: a child's bicycle having a usually detachable extra wheel placed on either side of the rear wheel to serve as support and guidance for a child learning to ride a bicycle
noun
: a child's bicycle having a usually detachable extra wheel placed on either side of the rear wheel to serve as support and guidance for a child learning to ride a bicycle
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012