A wheel, propelled by running or falling water, used to power machinery. / A wheel with buckets used to raise water.

The wheel of a wagon, including railway wagons.

(idiomatic) To do work unnecessarily when it has already been done satisfactorily by others; to attempt to devise a solution to a problem when a solution already exists.

(US) Alternative spelling of colour wheel

(British spelling) A planar circular chart in which related colours are adjacent, and complementary colors are opposite.

(mythology, philosophy) The mythological wheel whose turns, which are random, determine men’s fortunes. / A particular card in a tarot deck.

(road transport) A type of trailer hitch, which consists of a horseshoe-shaped plate on a multidirectional pivot, with a locking pin to couple with the kingpin of a truck trailer.

Alternative spelling of cogwheel

(mechanics) A wheel with a toothed rim, intended to engage with others, or similar equipment, to form a gear.

A domestic device for making yarn or thread; having a single spindle and a wheel driven by hand or foot.