From PIE *kwekwlos (circle), from *kwel- (to turn) — its spread across IE helped prove the PIE steppe homeland.
A circular frame or disc arranged to revolve on an axle, used to facilitate movement or perform work.
From Old English 'hwēol,' from Proto-Germanic *hwehwlą, from the PIE root *kʷékʷlos meaning 'wheel, circle,' a reduplicated form of *kʷel- ('to turn, to revolve'). This word is famous in historical linguistics: because cognates appear in every major branch of Indo-European — Greek 'kyklos,' Sanskrit 'cakra,' Old Church Slavonic 'kolo' — but show no evidence of borrowing, it proves that PIE speakers already had wheeled vehicles before the family dispersed, placing the PIE homeland no earlier than c. 3500 BCE. Key roots: *kʷel- (Proto-Indo-European: "to turn, to revolve, to move around").
The word 'wheel' helped prove where the Indo-Europeans originated. Because all major IE branches independently inherited *kʷékʷlos rather than borrowing it, PIE speakers must have had wheels — and since the wheel was invented around 3500 BCE on the Pontic steppe, this constrains the PIE homeland and dispersal date to that region and period.