349. Monosyllabic stems

Monosyllabic stems. Before the endings beginning with vowels, final ī is changed to iy and ū to uv; while final ā is dropped altogether, except in the strong cases, and in the acc. pl., which is like the nominative (according to the grammarians, ā is lost here also: no instances of the occurrence of such a form appear to be quotable). Stems in ī and ū are in the later language allowed to take optionally the fuller endings āi, ās, ām in the singular (dat., abl.-gen., loc.); but no such forms are ever met with in the Veda (except bhiyāí [?], RV., once). Before ām of gen. pl., n may or may not be inserted; in the Veda it is regularly inserted, with a single exception (dhiyā́m, once). The vocative is like the nominative in the singular as well as the other numbers; but instances of its occurrence in uncompounded stems are not found in the Veda, and must be extremely rare everywhere. The earlier Vedic dual ending is ā instead of āu.