Abstract: Based on the compositions of pre-courteous epic poetry and chivalric romance written in the Middle High German language, this article reviews the problem of lexical polysemy in relation to the phenomena of homonymy and synonymy, as well as the problem of structural description of lexis. The need for comprehensive examination of polysemous lexemes in the Middle High German language, which includes structural analysis of the meaning of polysemous word and the lexical-thematic group and/or synonymic row it belongs to, well as the study of contextual implementation of the meanings of polysemous word, is substantiated by the principle of diffusivity of meanings of polysemous word that complicates comprising dictionary definitions and creates difficulties for the researcher in distinguishing the meanings of a polysemous word and separating polysemy from homonymy. Based on the example of lexical-thematic group for denomination of edged weapon in the Middle High German Language, the author demonstrates the appropriateness of using lexical-semantic analysis for establishing systemic relations between the analyzed lexemes, as well as postulates the importance of the context in determination of the structure of polysemous word. Discussion of the given examples from the compositions of pre-courteous epic poetry and chivalric romance written in the Middle High German language is accompanied by the author’s clarifications to the dictionary definitions of the lexemes under review. The conclusion is made on feasibility of the authorial approach towards detection of the discrepancies between lexicographic data and use of the lexeme in the texts written in the Middle High German language. The author also believes that this research is valuable from the perspective of lexicographic practice.