fallacy

A fallacy is a deceptive or false notion. (noun)

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

See fallacy in Webster's New World College Dictionary

noun pl. fallacies

Obsolete deception
aptness to mislead; deceptive or delusive quality: the fallacy of the senses
a false or mistaken idea, opinion, etc.; error
1. an error in reasoning; flaw or defect in argument
2. Logic an argument which does not conform to the rules of logic, esp. one that appears to be sound

See fallacy in American Heritage Dictionary 4

(fălˈə-sē)

noun pl. fal·la·cies

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» Examples of Fallacies

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