The affix aṇ comes after a word denoting 'gold' when the sense is a weight or measure.,
The word जातरूप means 'gold'. It is used in the plural in the sutra, indicating that all words synonymous with gold are to be taken.
This debars मयट् &c. Thus हाटको निष्कः, हाटकं कार्षापणम्, जातरूपम्, तापमीयम् ॥
Why do we say 'meaning a measure'. Observe यष्टिरियं हाटकमयी ॥,