As a deity name
Name 353 of the Durga Sahasranāma — Kula Arnava Tantra / Skanda Purana, as taught by Lord Shiva to Goddess Parvati
As a Hindi name
Nearest attested word 'तपोनिष्ठा' does not appear as a word in our Hindi sources. The nearest word is तपोनिष्ठ, meaning तपस्वी. — Śabdasāgara nearest word: तपोनिष्ठ — a suggestion, not a meaning
As a Sanskrit word
Meaning
practising austerities — feminine form of taponiṣṭha
Scripturally attested Verified split — attested membersMultiple readings (2)Why this matches what you typed
M1 · same meaning "taponiṣṭhā" is the feminine form of "taponiṣṭha" — the same word with the feminine ending (nominative).
Dictionary citations
tapo—niṣṭha mfn. practising austerities, Mn. iii, 134; Yājñ. i, 221.
taponiṣṭha mfn. (-ṣṭhaḥ-ṣṭhā-ṣṭhaṃ) Performing penance, practising austerities. E. tapas, and niṣṭha engaged in.
Alternative readings
More than one analysis survives full verification. That ambiguity is real, so we show every reading rather than pick one silently.
Caveats
Sources contain errors and engines have limits; every claim above carries its citation so you can verify it. This is guidance about names and their sources — not religious or astrological consultation. How we work · Our sources