خوی

Inherited from Middle Persian [Term?] (/⁠xwēy⁠/, “sweat, perspiration”) from Proto-Iranian *hwáydah, from Proto-Indo-Iranian *swáydas (“sweat”), ultimately from Proto-Indo-European *swóyd-o-s from the root *sweyd- (“sweat, to sweat”). Cognate with Baluchi ہید (hed) and English sweat. Doublet of خوید.

Readings
Classical reading?	xway
Dari reading?	xuy
Iranian reading?	xoy
Tajik reading?	xuy

خوی • (xway) (archaic)

1. sweat

   Synonym: عرق ('araq)

2. sown field, acre, meadow (cf. خوید (xwêd))
3. herbage just sprouting above the ground
4. saddle-cloth, or dorsers below the saddle

Compare Old Armenian խոյր (xoyr), Persian خود (xôd).

خوی • (xôy)

1. (obsolete) helmet

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

خوی • (xôy)

1. Khoy (a city in West Azerbaijan Province, Iran)
2. Khoy County (a county of West Azerbaijan Province, Iran)

Otherwise خو (xô). Cognate to Sanskrit स्वधा (svadhā́). 

Readings
Classical reading?	xōy
Dari reading?	xōy
Iranian reading?	xuy
Tajik reading?	xüy

خوی • (xôy) (literary)

1. custom, wont
2. humour, nature, habit

• Müller, Friedrich (1894) “Pahlawi und neupersische Etymologien”, in Wiener Zeitschrift für die Kunde des Morgenlandes (in German), volume 8, pages 188–189
• Steingass, Francis Joseph (1892) “خوی”, in A Comprehensive Persian–English dictionary, London: Routledge & K. Paul, page 489b
• Vullers, Johann August (1855) “خوی”, in Lexicon Persico-Latinum etymologicum cum linguis maxime cognatis Sanscrita et Zendica et Pehlevica comparatum, e lexicis persice scriptis Borhâni Qâtiu, Haft Qulzum et Bahâri agam et persico-turcico Farhangi-Shuûrî confectum, adhibitis etiam Castelli, Meninski, Richardson et aliorum operibus et auctoritate scriptorum Persicorum adauctum‎^[1] (in Latin), volume I, Gießen: J. Ricker, page 764a