Since it sounds like the snap was quick, continous and immediately left the centers hand(s), and definately touched the ground before touching a lineman, I would say this was a legal snap and play on. However, if any of these things does not happen, then it would be an illegal snap and the ball would be blown dead.
Since a snap is defined in the rule book(s) you do not use the definition of a pass to determine legality of the snap.
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