Fallacy
Fallacy (fal"lȧ*sy) , noun
[Old English fallace, fallas, deception, French fallace, from Latin fallacia, from fallax deceitful, deceptive, from fallere to deceive. See Fail.]
1.
Deceptive or false appearance; deceitfulness; that which misleads the eye or the mind; deception.
Winning by conquest what the first man lost,
By fallacy surprised.
2.
(Logic) An argument, or apparent argument, which professes to be decisive of the matter at issue, while in reality it is not; a sophism.