In the 19th century, broad functional development begins in the field of styles, where there is an even greater stability of linguistic norms, the increase in national characteristics and internal capabilities of the language, as well as the widespread use of various stylistic methods in speech, which they begin to record in dictionaries. The relevance of the study is explained by the interest in the dialectal vocabulary of the Tatar language, as one of the components of the lexical fund of bilingual dictionaries of the 19th century. The purpose of the study is to determine the role of dialect words in the system of Tatar speech of the 19th century, as one of the Turkic languages. In the course of the study, the authors studied the modern works of Russian and foreign authors on linguistics, lexicography; the dialectal material recorded in the Russian-Tatar dictionaries of the 19th century is analyzed; comparisons are made between the dictionary by M. Kashgari and the modern Tatar language.