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Falsism

A falsism is a claim that is clearly and self-evidently wrong. A falsism is usually used merely as a reminder or as a rhetorical or literary device. An example is "pigs can fly." It is the opposite of truism. A falsism is similar to, though not the same as, a fallacy.

The Collaborative International Dictionary

Falsism

Falsism \Fals"ism\, n. That which is evidently false; an assertion or statement the falsity of which is plainly apparent; -- opposed to truism.

Wiktionary

falsism

n. A claim that is self-evidently false, commonly used a rhetorical device.