turbine

n. Rotary motor driven by a flow of water, steam, gas, wind, etc. [latin turbo -in- spinning-top, whirlwind]

n. A water wheel, commonly horizontal, variously constructed, but usually having a series of curved floats or buckets, against which the water acts by its impulse or reaction in flowing either outward from a central chamber, inward from an external casing, or from above downward, etc.; -- also called turbine wheel.