Where does “training wheel” come from?

training wheel (English) comes from English training, from English train, from Middle English train, from Old French train, from Old French traïner, from Vulgar Latin traginare, from Latin tragēre, from Latin trahere — to run.

training wheel (English): 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

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

Ancestry of “training wheel”, step by step

training wheel traces back through two separate lines of ancestry.

via English training

StepLanguageWordMeaning
1Englishtrainingpresent participle of train; Action of the verb...
2EnglishtrainElongated portion; Connected sequence of people...
3Middle Englishtrain
4Old Frenchtraina delay, a drawing out
5Old FrenchtraïnerAlternative form of trainer; to pull out, to draw
6Vulgar Latintraginarepresent active infinitive of *traginō
7Latintragēre
8Latintraheresecond-person singular future passive indicative...
9LatintrahoI drag, pull; I trail; I extract, withdraw
10Proto-Italictraɣō
11Proto-Indo-Europeantregʰ-to drag, pull?; to run, walk
12Proto-Indo-Europeandʰregʰ-to run

via English wheel

StepLanguageWordMeaning
1EnglishwheelA circular device capable of rotating on its...
2Middle EnglishwhelA wheel circular device for motion
3Old Englishhwēolwheel
4Proto-Germanichweulōnominative/vocative/accusative plural of *hwehwlą
5Proto-Indo-Europeankʷékʷléh₂
6Proto-Indo-Europeankʷékʷloswheel; circle
7Proto-Indo-Europeankʷel-to turn
Every word from Proto-Indo-European dʰregʰ-