The article reflects the main results of comparative-typological study concerning the organization of terminological phrases on the basis of four closely related languages - French, Spanish, Italian and Romanian. Attention is focused on the study of theme-rheme organization of phrases on the material of multilingual and bilingual dictionaries in some of the most priority areas of electronics and electrical engineering. Despite the isomorphism of the studied languages, the complex use of a

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... of methods (comparative-typological method, quantitative analysis, actual division method, questioning of specialist informants) allowed to detect several allomorphic features in the theme-rheme organization of their word combinations. They consist in the use of possessive and definite articles, prepositions, and ordinal numbers. The presence of possessive articles in the Romanian language is recognized as the most striking allomorphic property, thanks to which theme-rheme organization of a Romanian word-combination becomes more transparent in comparison with other Romance languages. The importance of the study of allomorphic features of languages for lexicography, theory and practice of translation is emphasized.