The Suppressed correlative reference article from the English Wikipedia on 24-Apr-2004
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Suppressed correlative

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The logical fallacy of suppressed correlative is a type of argument which tries to redefine a correlative (two mutually exclusive options) so that one alternative encompasses the other, i.e. making one alternative impossible.

Examples:

Anne: "OK, I can prove that Ants are not small. To Bacteria they are large"''.
Bill: "OK, so Bacteria are small!".
Anne: "No, because to a virus they are large. Everything is large to something, so nothing is really small!"

This type of fallacy is often used in conjunction with one of the fallacies of definition, once the priest has used a suppressed correlative to demonstrate that something must be true they will switch back to the standard definition. For example the priest, having got the atheist to say that by the given definition there must be a God could say that since you believe there must be a God you should go to church, pray to Jesus etc.

See Also

correlative based fallacies