وَجُمْجُمَةٌ مِثْلُ الْعَلَاةِ كَأَنَّمَا
وَعَى الْمُلْتَقَى مِنْهَا إِلَى حَرْفِ مِبْرَدِ
Her skull resembles a heavy stone block, as if its meeting edges had been gathered firmly together and brought to a narrow, file-like rim.
Jumjumah is the skull; al-ʿalāh is a solid, heavy stone used as a visual model. The verse concerns not only size but also the firmness and meeting of the skull’s bony parts.
Al-multaqā is a point of junction; mibrad brings in the impression of a hard, narrow, file-like edge. The comparison depicts a well-joined, powerful structure rather than suggesting that the animal literally has stone bones.