kaniṣṭhá and mfn. the youngest, younger born (opposed to jyeṣṭha and vṛddha) RV. iv, 33, 5 AV. x, 8, 28 AitBr. KātyŚr. &c

kániṣṭha mfn. the youngest, younger born (opposed to jyeṣṭha and vṛddha) RV. iv, 33, 5 AV. x, 8, 28 AitBr. KātyŚr. &c
• the smallest, lowest, least (opposed to bhūyiṣṭha) TS. ŚBr. &c
• m. a younger brother L
• (scil. ghaṭa) the descending bucket of a well, Kuv
• (ās), m. pl., N. of a class of deities of the fourteenth Manvantara VP
• (ā), f. (with or without aṅguli) the little finger Yājñ. i, 19 R. Suśr
• a younger wife, one married later (than another) Mn. ix, 122
• an inferior wife Vātsy. (cf. kaṇa and kanyā.)

kaniṣṭha &c. p. 248, col. 3

Sanskrit-English Dictionary, by M. Monier William