347. The stems ending in long vowels

Declension III.
Stems in long vowels: आ ā, ई ī, ऊ ū.

The stems ending in long vowels fall into two well-marked classes or divisions: A. monosyllabic stems—mostly bare roots—and their compounds, with a comparatively small number of others inflected like them; B. derivative feminine stems in आ ā and ई ī, with a small number in ऊ ū which in the later language have come to be inflected like them. The latter division is by far the larger and more important, since most feminine adjectives, and considerable classes of feminine nouns, ending in आ ā or ई ī, belong to it.