Logic. Also 6 pheryson. A mnemonic word representing the sixth mood of the third figure of syllogisms (quantitatively similar to Ferio, but differing in the position of the middle term).
1509. Barclay, Shyppe of Folys (1874), I. 144. Another comyth in with bocardo and pheryson.
1741. Chambers, Cycl., s.v. Mood, Ferison.
1864. Bowen, Logic, vii. 200. There remain for the Third Figure six Moods, named Darapti, Disamis, Datisi, Felapton, Bokardo, and Ferison.
