We don't have synonyms for ferison yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are frison and fergison.
(n) :
(logic) A syllogism having a universal negative as its first premise, a particular affirmative as its second premise, and a particular negative as its conclusion, and structured according to the third figure.
(n) :
(logic) A syllogism having a universal negative as its first premise, a particular affirmative as its second premise, and a particular negative as its conclusion, and structured according to the third figure.