While the word hybrid is bantied about on this site, it is misused. Hybrid is a horse and a mule, a cow and a bison, not a chicken and a chicken. that is a cross breed when talking about varieties and not species. This is all the fault of seed companies that purposely misuse the word hybrid.
I think that people often mean different things when they use the word "hybrid". Some people use it in the way of a Horse+Donkey=Mule or a Lama+Camel=Cama. But other people use it as a Barred Rock+Rhode Island Red= Black Star.
I view the meaning of the word as: something that when bred to itself, will not produce something like itself.