الجنس وهو كلي مقول على كثيرين مختلفين بالحقائق في جواب «ما هو؟»
A genus is a universal said of many things differing in their specific natures, in answer to “What is it?”
The definition includes four elements: universality, plurality, differences of specific nature, and being a reply to the what-is-it question.
Animal is predicated of humans, horses and sheep. Their species-natures differ, but the generic aspect of animality belongs to each.