Fallacy definitions

făl'ə-sē
A false notion.
noun
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A statement or an argument based on a false or invalid inference.
noun
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1
Incorrectness of reasoning or belief; erroneousness.
noun
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The quality of being deceptive.
noun
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Deception.
noun
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Aptness to mislead; deceptive or delusive quality.

The fallacy of the senses.

noun
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A false or mistaken idea, opinion, etc.; error.
noun
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The definition of a fallacy is a deceptive or false notion.

An example of fallacy is the idea that the sun spins around the earth.

noun
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An error in reasoning; flaw or defect in argument.
noun
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An argument which does not conform to the rules of logic, esp. one that appears to be sound.
noun
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Deceptive or false appearance; deceitfulness; that which misleads the eye or the mind; deception.
noun
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(logic) An argument, or apparent argument, which professes to be decisive of the matter at issue, while in reality it is not. A specious argument.
noun
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Origin of fallacy

Alteration of Middle English fallace from Old French from Latin fallācia deceit from fallāx fallāc- deceitful from fallere to deceive