Objective. To carry out the lexical-stylistic study of the scientific medical texts concerning the correct use of terminological units with propriatives.Material and methods. Selection of actual material from Dorland's "English-Ukrainian illustrated medical dictionary" (two volumes) and "Endocrinology dictionaryreference" by Kazakova A.V., Kravchun N.A., Il'ina I.M. enabled to show the use of eponimum vocabulary in medical terminological system in the light of systematization ofthe lexical-stylistic methods of the research.Results. The research testifies that just the use of the general onomastic principles (etymological, formant (word-formation) and lexical-semantic) will give the possibility to expose maximally the nomination nature of the compound medical terms, to define interlingual connections, to indicate historical-anthroponimic character of terminological units'denominatios containing proper names.Conclusion. The suggested investigation has practical direction and theoretical substantiation due to the connection with important scientific tasks of the present time - usage of official national terminology for practical doctors, scientists of different specialties, in educational process - for training of competent specialists in various morphological subjects.