'Safety bicycle' definitions:

Definition of 'safety bicycle'

From: WordNet
noun
Bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear [syn: safety bicycle, safety bike]

Definition of 'Safety bicycle'

From: GCIDE
  • Safety bicycle \Safety bicycle\ A bicycle with equal or nearly equal wheels, usually about 28 inches diameter, driven by pedals connected to the rear (driving) wheel by a multiplying gear. Since the 1930's this has been the most common type of bicycle, now simply called bicycle. The older high-wheelers are often referred to as bone-rattlers. [Webster 1913 Suppl. +PJC]