n. A fallacious argument or illogical conclusion, especially one committed by mistake, or believed by the speaker to be logical.
the GNU version of the Collaborative International Dictionary of English
n. A reasoning which is false in point of form, that is, which is contrary to logical rules or formulæ; a formal fallacy, or pseudo-syllogism, in which the conclusion does not follow from the premises.
The Century Dictionary and Cyclopedia
n. In logic, fallacious argument or false reasoning; reasoning which is false in form—that is, in which the conclusion does not follow from the premises; a conclusion unwarranted by the premises.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an unintentionally invalid argument
Word Usage
"The attack on the third paralogism focuses on what can be inferred from unified consciousness over time."