369. This declension is a comparatively limited

Declension IV.
Stems in ऋ  (or अर् ar).

This declension is a comparatively limited one, being almost entirely composed of derivative nouns formed with the suffix तृ tṛ (or तर् tar), which makes masculinenomina agentis (used also participially), and a few nouns of relationship.

a. But it includes also a few nouns of relationship not made with that suffix: namely devṛ́ m., svásṛ and nánāndṛ f.; and besides these, nṛ́ m., stṛ́ (in V.) m., usṛ́ (in V.) f., savyaṣṭhṛ m., and the feminine numerals tisṛ and catasṛ (for which, see 482 e, g). The feminines in tṛ are only mātṛ́, duhitṛ́, and yā́tṛ.

b. The inflection of these stems is quite closely analogous with that of stems in i and u (second declension); its peculiarity, as compared with them, consists mainly in the treatment of the stem itself, which has a double form, fuller in the strong cases, briefer in the weak ones.