In logic, a syllogistic mood in the second figure where the major premise is universal affirmative, the minor is universal negative, and the conclusion is particular negative.
From Medieval Latin 'ferio,' likely derived from 'ferro' (I strike or wound), metaphorically applied to the striking of logical conclusions. The term is part of the Latin mnemonic system developed by medieval logicians.
Medieval scholars created a mnemonic poem where each mood of logic got a Latin name—'ferio' is part of this, and the vowels in these names (A, E, I, O) actually encode whether premises and conclusions are affirmative or negative!
Complete word intelligence in one call. Free tier — 50 lookups/day.