Judeo-Kashani is distinct from Persian (and Judeo-Persian for that matter) and bears typological similarity to the varieties spoken by Jewish communities in other cities such as Hamadan and Isfahan.
The Jewish community of Kashan, like other Persian Jews.,[5] historically (until the 1930s) wrote in Judeo-Persian for religious, literary, and economic purposes.
Judeo-Persian is simply the Persian language written in Hebrew script; it should not therefore be confused with Judeo-Kashani, which belongs to the Median branch of Iranian languages[6] The term Jidi was the endomic name of Judeo-Kashani; this term has nothing to do with Judeo-Persian (a confusion practiced by various authoritative references, including Ethnologue).
The similarities between Judeo-Kashani, Judeo-Isfahani, and Judeo-Hamedani, and their differences from Persian, can be explained by the extensive historical contact and ties between the Jewish communities in Central Iran.
[6] Following the mass emigration of Jews from Central Iran to Tehran and abroad, the Jewish population of Kashan dropped drastically from thousands in the 1940s to being gone by the end of the twentieth century.
Diphthongs are typically split when suffixed by a vowel in an ezafe construction, as seen through the alternation between xåu ('sleep') vs. xåv-i ('of sleep').
[3] The following text is an excerpt from a set of letters written by local Jewish residents of Kashan, collected by Valentin Zhukovski in the mid-1880s.