After adhi that word which denotes that thing which overlaps or stands upon has the acute accent (udātta) on the final.,
Thus अधिदन्तः꣡ = दन्तस्योपरि योऽन्योदन्तो जायते 'a tooth that grows over another tooth'.अधिकर्णः꣡, अधिकेशः꣡ ॥ These are प्रादि samasa or an appositional compound in which the second member has been dropped. Why do we say when meaning 'standing upon'? Observe अधिक꣡रणम् Here the acute is on क, the krit-formed second member retaining its accent 6.2.139.,