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The definition of "seal" given as: anything that tightly or completely closes or secures a thing, as closures or fastenings for doors and railroad cars, adhesive stamps and tapes used to secure the flap of an envelope, etc. So in that sense you are most correct. I had originally written a blurb about turbos not having a seal in the sense that a cam shaft seal is designed not to leak any oil, or at least not to my knowledge (it would be interesting to learn if they had a way of using oil from the wet side to lube the ring contacting the cam with minimal leakage). I removed it before posting to let the engineering speak for itself and avoid repeating the article I quoted but the gist of it being that that tends to be what people think of when an oil seal comes to mind and turbos do not have these types of seals, as you mentioned. Piston rings are definitely a type of seal but they could also be described as control rings as they are not designed to seal 100%. Indeed the functioning of the piston ring requires a small amount of leak to expand it against the mating surface (that would be another interesting bit to learn, how the piston ring in a turbo is designed to expand given that I wouldn't think it would be spinning on the shaft). Anyway, better?
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