Words and Proper Names

*apo > * ao

3293.
Hamp (Eric P.): Varia: I. 2. Notes on some Indo-European preverbs.
In Ériu 24 (1973), pp. 163–167.
*e(p)i- in é(i)thech (with same base as díthech and fre(i)tech); *eti- in e(i)tech; óL < *au and *apo > *ao; OIr. ind-, imbL, íar(m-), ol, sech, coh, doL, ro (idiosyncratic) related to L pro-sum.