deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
The pronoun base dvi- द्विॱ means "two".
When not compounded, it becomes dva द्व by tyadAdInAmaH and only takes dual endings. So it behaves like a normal /kta base, with /Ap when f —
/dvi- m + /au
dva- द्वॱ + /au by tyadAdInAmaH
→ !**dvau द्वौ m like **azvau अश्वौ
dva- द्वॱ n + /au
→ !**dve द्वे like **phale फले "two fruits"
dvA- द्वाॱ f + /au
→ !**dve' द्वेऽ like **azve' अश्वेऽ "two mares"
dva- द्वॱ + /bhyAm
→ !**dvAbhyAm द्वाभ्याम् like **azvAbhyAm अश्वाभ्याम्
dva- द्वॱ + /os
→ !**dvayos द्वयोस् like **azvayos अश्वयोस्