أو غير مركب كالجوهر يعني العين الذي لا يقبل الانقسام
Or it may be noncomposite, like the substance that does not admit division.
Here jawhar fard refers to a basic indivisible constituent. It marks the difference between a composite body and a purported elementary substance.
It does not simply mean something extremely small. A tiny object may still be divisible. The defining assertion is incapacity for division, not invisibility or small observable size.