القياس السفسطي، وهو قياس مركب من الوهميات الكاذبة المخترعة للوهم
A sophistical syllogism is composed of false illusory propositions fabricated by the faculty of estimation.
Here wahm (estimation) means a tendency to extend the way sensible objects are judged to matters that are not sensible in the same way. When an untrustworthy premise is placed into an apparently proper inference, the reasoning can look plausible while lacking sound material.
The commentary also develops mushabbahāt (deceptively similar premises): false claims that resemble credible propositions and thereby mislead.