| maximum deviation of an alternating current from its average value |
| coefficient of substance's elasticity expressing ratio between pressure and fractional change |
windmill (ˈwɪndˌmɪl, ˈwɪnˌmɪl) ![]() | |
| —n | |
| 1. | a machine for grinding or pumping driven by a set of adjustable vanes or sails that are caused to turn by the force of the wind |
| 2. | the set of vanes or sails that drives such a mill |
| 3. | (Brit) Also called: whirligig, US and Canadian name: pinwheel a toy consisting of plastic or paper vanes attached to a stick in such a manner that they revolve like the sails of a windmill |
| 4. | an imaginary opponent or evil (esp in the phrase tilt atorfight windmills) |
| 5. | Compare ram-air turbine a small air-driven propeller fitted to a light aircraft to drive auxiliary equipment |
| 6. | an informal name for helicopter |
| 7. | an informal name for propeller |
| —vb | |
| 8. | to move or cause to move like the arms of a windmill |
| 9. | an informal name for accommodation bill |
| 10. | (intr) (of an aircraft propeller, rotor of a turbine, etc) to rotate as a result of the force of a current of air rather than under power |