Paishachi or Paisaci (IAST: Paiśācī) is a largely unattested literary language of the middle kingdoms of India mentioned in Prakrit[2] and Sanskrit grammars of antiquity.
Evidence which lends support to the former interpretation is that literature in Paiśācī is fragmentary and extremely rare but may have been once common.
Acharya Hemachandraacharya, includes six languages: Sanskrit, the "standard" Prakrit (virtually Maharashtri Prakrit), Shauraseni, Magahi, Paiśācī, the otherwise-unattested Cūlikāpaiśācī and Apabhraṃśa (virtually Gurjar Apabhraṃśa, prevalent in the area of Gujarat and Rajasthan at that time and the precursor of Gujarati language).
The 13th-century Tibetan historian Buton Rinchen Drub wrote that the early Buddhist schools were separated by choice of sacred language: the Mahāsāṃghikas used Prākrit, the Sarvāstivādins used Sanskrit, the Sthaviravādins used Paiśācī, and the Saṃmitīya used Apabhraṃśa.
[citation needed] Talking of its existence, Pollock writes:[5]: 92 Linguists have identified this as everything from an eastern Middle-Indic dialect close to Pali to a Munda language of inhabitants of the Vindhya Mountains […] In fact there is little reason to bother to choose […] Paishachi is the joker in the deck of South Asian discourses on language, having an exclusively legendary status, since it is associated with a single lost text, the Bṛhatkathā (The Great Tale), which seems to have existed less as an actual text than as a conceptual category signifying the Volksgeist, the Great Repository of Folk Narratives […] In any event, aside from this legendary work (which "survives" only in one Jain Maharashtri and several Sanskrit embodiments), Paishachi is irrelevant to the actual literary history of South Asia.There is one chapter (chapter 10) dedicated to Paisachi Prakrit in Prakrita Prakasha, a grammar book of Prakrit languages attributed to Vararuchi.