With the analysis of a textbook case, the inflectional category of dual in contemporary French, this article presents the hypothesis of a rise in morphology among the founding disciplines of grammar in written languages. Through a study of morphographies, this trend is considered here as a result of the emergence and development of so-called electronic dictionaries, with their lexicographical words as entries to access form / meaning associations. We know that these dictionaries, piloted by mixed teams of computer scientists and linguists, impose themselves step by step as major classificatory tools for the most general treatments, in theoretical and applied linguistics, now related in our modernity to the exploitation of large corpora that have become digitised.