The article presents the result of the procedure for resolving the issue of forming dictionary vocables, as well as organizing a dictionary entry in the dictionary of the language of the Yakut heroic epic Olonkho, proclaimed by UNESCO in 2005 as a masterpiece of the oral and intangible cultural heritage of humanity. The question was one of the rather complex problems in the theoretical development of a dictionary of the Olonkho language. The high degree of formulaicity of the language of the Yakut epic, the originality of the stylistics of the epic narrative and the characteristic features of the language of the Turkic peoples generated a complex of original properties of the Olonkho language, which determined the problematic character of lexicographic works. However, when developing the macro- and microstructure of dictionaries of the language of folklore, an unconventional solution to the problem is allowed, and therefore the work proposes a special structure of a dictionary entry, as well as methods for forming non-standard forms of dictionary vocables. To achieve the goal, we analyzed the functional and semantic features of the lexeme aghys ʻeightʼ in the olonkho text Nurgun Bootur the Swift by K. G. Orosin (1947). As a result of the analysis, the following points were clarified and determined: 1. it was decided to present stable verbal complexes of the Olonkho language (i. e. epic formulas, formulaic constructions, constructions of a formulaic nature), phraseological units, single lexemes and epic periods as vocabulary vocables. The main factors that served as support for making such a decision were the distinctive feature of the Turkic languages – the law of synharmonism, as well as the diffuse nature of the meaning of folk expressions, which requires an integrated approach to the compilation of dictionary definitions, including in the design of the lemma part of the dictionary. The basic principles of the structure of dictionary entries in the Olonkho language dictionary are indicated: the order of presentation of units of lexicographic description, the order of presentation of stable verbal complexes, principles of presentation of material, features of presentation of illustrative material. In developing the described principles, we relied on individual aspects of the theoretical positions expressed in the works of our predecessors, specializing in the field of Russian lingua-folkloristics, Russian folklore lexicography, in Turkic studies, as well as the result of a comprehensive analysis of materials from the K. G. Orosin’s olonkho text of Nurgun Bootur the Swift. In the course of further lexicographical work, it will obviously be possible to make minor adjustments, since the language material of the Yakut epic is extremely diverse. However, the result obtained in this article, in this aspect, will definitely form the basis of lexicography.