A ḥadd explains what something is through elements treated as constitutive of its essence. “Human — rational animal” combines a general essential component with a differentiating one. Explaining a human instead through a distinctive capability such as laughter belongs to the book’s account of rasm, not ḥadd.
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The meaning of an essential definition (ḥadd)
Definitions in Logic: Complete and Incomplete Ḥadd and Rasm
A ḥadd explains what something is through elements treated as constitutive of its essence. “Human — rational animal” combines a general essential component with a differentiating one. Explaining a human instead through a distinctive capability such as laughter belongs to the book’s account of rasm, not ḥadd.