A unique tool for Russian language studies: the complete vocabulary of more than 100,000 words from the 1959 Ozegov and Sapiro dictionary, segmented into their constituent elements and grouped into 10,953 families ("derivational nests"). Each root has 1 to 16 variant subfamilies, alphabetically arranged by root, occurrence root, preroot segment, and postroot segment. No such derivational dictionary exists for any other modern language. This is the first for Russian since 1836, despite the central importance of derivational morphology to the Russian linguistic system. Massive theoretical and practical difficulties arise because, for example, Russian phonemes may participate in more than one series of letter alternations and most compounds are also suffixal derivatives. Each such case was considered separately for maximum usefulness of grouping. The clerical part of the 7-year effort was done by computer, with manual changes in about 30% of the cases.
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