present participle of reinvent the wheel.

The action of taking the effort to devise a solution to a problem, unaware of the fact that someone else has already devised the same solution to the same problem.

A water wheel placed below a fall or in a chute where rapidly moving water strikes the tips of the floats.

A device for producing straight-line motion from circular motion, on the principle that a pin fastened in the periphery of a gear wheel will describe a straight line when the wheel rolls around inside a fixed internal gear of twice its diameter.

prayer wheel

A noria.

(horology) The wheel of an escapement.

A variety of bournonite with wheel-shaped twin crystals.

Alternative form of millwheel

(Buddhism) A rotating cylinder either inscribed with or containing prayers, mainly used by Tibetan Buddhists.