quad bike - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

From quad (“four (“4”)”) +‎ bike (“bicycle”). From being a 4-wheeled quadricycle vehicle that is ridden astride like a dirt bike (“motorcycle”).

quad bike (plural quad bikes)

1. A small off-road four-wheeled powered vehicle, especially of a design derived from a motorcycle, usually used for recreation or farm work.

• quad, four-wheeler

• all-terrain vehicle / ATV

• side-by-side / SxS
• dirt bike