Pa*ral"o*gism (?), n. [Gr. , fr. to reason falsely; beside + to reason, discourse, reason: cf. F. paralogisme.] Logic
A reasoning which is false in point of form, that is, which is contrary to logical rules or formulae; a formal fallacy, or pseudo-syllogism, in which the conclusion does not follow from the premises.
© Webster 1913.