Definitions from Wiktionary (training wheel)

▸ noun:  (military, historical) A wheel forming part of the machinery of a cannon or a similar firearm which is turned to train or aim the weapon at a target.
▸ noun:  (rail transport, archaic) Synonym of trailing wheel (“on a steam locomotive, an unpowered wheel or axle located behind the driving wheels”)
▸ noun:  (chiefly Canada, US and in the plural, cycling) One of a pair of small wheels, each attached to one side of a bicycle's rear wheel to provide support for new riders.



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