Sentence:  Turbines have been around for a long time—windmills and water wheels are early examples. The name comes from the Latin "turbo", meaning "vortex", and thus the defining property of a turbine is that a fluid or <WSD>gas</WSD> turns the blades of a rotor, which is attached to a shaft that can perform useful work. 
Meaning of the word marked with <WSD> tags:  Matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid) (or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly.