Definition
A tread-wheel is essentially the same as a 'treadwheel.' It's a large wheel powered by humans or animals walking inside it. Think of it as a historical engine powered by footsteps. It was primarily used for tasks like lifting heavy objects or grinding grain. Visualize a giant hamster wheel powering a mill or a construction site. Itβs an early form of converting manual labor into mechanical energy. The hyphenated form emphasizes the connection between the 'treading' action and the 'wheel'.