Definition

Noun: 1. A wheel that rotates by the direct action of water; a simple turbine. This is a mechanical device, often large, where flowing or falling water pushes against paddles or blades mounted around a wheel, causing it to turn. This rotation was historically used to power machinery like millstones. 2. A wheel with buckets attached to its rim; raises water from a stream or pond. This is a pump-like device, often called a noria. The wheel's rotation dips the buckets into a water source to fill them, then lifts and empties them at a higher point to move water for irrigation or other uses.

Usage Examples

• As a power source:
  • The old gristmill was powered by a massive waterwheel in the river.
  • The invention of the waterwheel was a crucial step in early industrial development.
• As a water-lifting device:
  • Farmers used a waterwheel to lift water from the canal to their fields.
  • The ancient waterwheel, with its series of clay pots, still turns slowly, irrigating the garden.

Advanced Usage

• "Overshot waterwheel": A type where water is delivered to the top of the wheel. This design is highly efficient as it uses both the weight and the flow of the water.
  • The restored mill features an overshot waterwheel that captures water from a raised aqueduct.
• "Undershot waterwheel": A type where water flows beneath the wheel, pushing the paddles. It is simpler but less efficient, suitable for slower, broader rivers.
  • The undershot waterwheel in the lowland stream provided just enough power for the small workshop.

Variants and Related Words

• Water mill (n): A building housing machinery (like millstones) driven by a waterwheel.
  • They visited the historic water mill to see how flour was made.
• Noria (n): A specific term for a waterwheel designed primarily to raise water, often using pots or buckets.
  • The iconic noria of Hama in Syria is a famous example of ancient hydraulic engineering.
• Turbine (n): A modern, more efficient rotary engine that extracts energy from a fluid flow. The waterwheel is considered a simple, early form of turbine.
  • Hydroelectric dams use advanced turbines, not traditional waterwheels, to generate power.

Synonyms

• Millwheel: Specifically denotes a waterwheel used to drive a mill.
• Water wheel (two words): An alternative spelling of the same device.

Related Phrases

• To turn like a waterwheel: To rotate steadily and continuously.
  • The old machinery groaned as it began to turn like a waterwheel.
• Waterwheel effect: A metaphorical term describing a cyclical or repetitive process.
  • The constant back-and-forth of emails created a waterwheel effect that consumed his day.

Noun

1. a wheel that rotates by direct action of water; a simple turbine
2. a wheel with buckets attached to its rim; raises water from a stream or pond