The affix ki comes under similar circumstances after a ghu verb -- dādhā ghvadāp [[1.1.20]] when an upasarga is in composition with it.,
The क् is indicatory, by force of which the final आ is elided 6.4.64. Thus प्र + दा + कि = प्रदिः 'a present'; प्रधिः 'the periphery of a wheel'; उपाधिः 'fraud'; अन्तर्द्धिः 'vanishing'.,