पस्त्य

Uncertain. Usually connected with Old Armenian հաստ (hast, “firm, steady, standing still, tough; thick, dense, broad”) and Proto-Germanic *fastuz (“fixed, firm, secure”), and derived from Proto-Indo-European *pastV- (“solid, stable”), implying "stable habitation".

Martirosyan derives it from a non-Indo-European substrate word shared by Armenian, Germanic, possibly also Indo-Aryan. See հաստ (hast) for more.

Kroonen separates Sanskrit from Armenian and Germanic and hypothesizes a derivation from Proto-Indo-European *h₂po-sth₂-io.

पस्त्य • (pastyá) n

1. stall, stable (as the back-building?)

• Monier Williams (1899), “पस्त्य”, in A Sanskrit–English Dictionary, […], new edition, Oxford: At the Clarendon Press, OCLC 458052227, page 0612.
• Mayrhofer, Manfred (1996) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan] (in German), volume II, Heidelberg: Carl Winter Universitätsverlag, page 111
• Mallory, J. P.; Adams, D. Q., editors (1997) Encyclopedia of Indo-European culture, London, Chicago: Fitzroy Dearborn Publishers, page 204b
• Martirosyan, Hrach (2010), “hast”, in Etymological Dictionary of the Armenian Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 8), Leiden, Boston: Brill, page 390
• Kroonen, Guus (2013), “*fastu-”, in Etymological Dictionary of Proto-Germanic (Leiden Indo-European Etymological Dictionary Series; 11), Leiden, Boston: Brill, page 138