The affix ap comes after the verb han 'to kill' when the words ayas , vi or dru are in composition with it, when the word so formed is related to the verb as an instrument and ghan is the substitute.,
As अयोघनः 'a forge-hammer' (whereby the iron is destroyed); विघनः 'a mallet'; द्रुघनः 'an axe'. Some write द्रुघणः, the न being changed into ण either by rule (VIII. 4. 3.) or by including this word in the class of आरोहणादि 4.2.80.,