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This paper presents a first step towards constructing the diachronic Romanian morphology. First, the "deformation " of a word is introduced and a classification of such deformations is proposed. The conducted research aims at detecting deformations in the roots of inflectional words (nouns, adjectives and verbs). The algorithm we present uses two important resources: a morphological dictionary of the current Romanian language, which also models the inflectional paradigms of the language, and eDTLR – the digital version of the Romanian Thesaurus Dictionary. In eDTLR each title word has associated a set of citations extracted from the Romanian literature, each having attached the year of publication. The algorithm detects root deformations in words by comparing word forms of the current language with forms extracted from the eDTLR citations. For every root change, the deformed root is deducted and all the diachronic forms are inferred. Also, using the chronology of citations, for each diachronic root a period or a year is established. The research was conducted on 4 volumes of eDTLR. The algorithm successfully detected 2,700 root deformations and inferred a total of 30,000 diachronic inflexions. 1. Morphological sources for Romanian language eDTLR 1 (Cristea et al., 2007) is the digital version of Romanian Language Dictionar