The affix ap comes after the verb han 'to kill' when the word so formed means 'solidity' and ghan is the substitute.,
The word मूर्त्ति means 'hardness', 'solidity'. Thus अभ्रघनः 'a mass of cloud'; दधिघनः 'solid curd'. How do we say घनं दधि ? Here the quality is taken for the thing qualified.,