# training wheel

> English word · Noun · IPA /ˈtɹeɪnɪŋ wiːl/

## Definitions
1. 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.
2. Synonym of trailing wheel (“on a steam locomotive, an unpowered wheel or axle located behind the driving wheels”).
3. One of a pair of small wheels, each attached to one side of a bicycle's rear wheel to provide support for new riders.

## Etymology
From training (“relating to the moving of a firearm laterally so that it points in a different direction; relating to imparting and acquiring skills”) + wheel.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/training-wheel