As a deity name
Name 286 of the Durga Sahasranāma — Kula Arnava Tantra / Skanda Purana, as taught by Lord Shiva to Goddess Parvati
Name 976 of the Gayatri Sahasranāma — Devi Bhagavata Purana, as taught by Sages
As a Hindi name
सुस्तनी · noun · feminine
सुंदर छातियोंवाली स्त्री । सुंदर स्तनों से युक्त स्त्री · वह स्त्री जो पहली बार रजस्वला हुई हो — Śabdasāgara cross-reference followed: दे॰ सुस्तना
Cited formation "सुस्तनी" is सुस्त + -नी: सुस्त means "slow (not quick in motion)", and the suffix -नी forms feminine of some nouns. CHD Basic Grammar App. II §5 — cited from the extracted rule table
Cited formation "सुस्तनी" is सुस्ता + -नी: सुस्ता means "1˚ = sust, q.v", and the suffix -नी forms feminine of some nouns. CHD Basic Grammar App. II §5 — cited from the extracted rule table — base gloss: Platts (1884), digital edition courtesy DSAL, University of Chicago
Cited formation "सुस्तनी" is सु- + स्तनी: स्तनी means "जिसके स्तन हो । स्तनयूक्त । स्तनवाला । जैसे, सुस्तनी, अर्थात् सुंदर स्तनोंवाली", and the prefix सु- forms good, easily. CHD Basic Grammar App. I §3(18) — cited from the extracted rule table — base gloss: Śabdasāgara
As a Sanskrit word
Meaning
su—stanā or su—sta˚nī, (a woman) having beautiful breasts, Sch.
Scripturally attested Verified derivationWhy this matches what you typed
The spelling you confirmed, सुस्तनी, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
su—stanā or su—sta˚nī, f. (a woman) having beautiful breasts, Pāṇ. iv, 1, 54, Sch.
Caveats
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