This study presents a proposal for a didactic use of the Online Electronic Monolingual Dictionary, called Vocabolario Treccani, as an Italian learning tool for teachers and students of CELs (Center of Language Studies operating in public schools of São Paulo State). The theoretical basis adopts the conception of the dictionary use in foreign language studies presented by Zucchi (2010), Corino and Marello (2010). Activities were offered to CELs" Italian teachers in two lectures-2013 and 2014-, in order to contribute to the continuing education of Italian teachers, specifically by dealing with the Pedagogical lexicography (Welker 2008). On the second lecture, the Italian teachers answered to a questionnaire that served as a mapping to observe the needs for a deepening in the Lexical Studies and in the use of the dictionaries during classroom. Furthermore, we also tried to explain all the resources available in the Vocabolario Treccani website, that can aid in activities search and lexical comprehension, and showed that this website is a facilitator in the study of the learning context when concerning the Italian language, stating that activities that requires the use of dictionaries must not be reduced to simple vocabulary research exercises. For this purpose, we formulated a notebook full of activities for those teachers with the purpose of encouraging the Italian learners to incorporate the use of the online electronic dictionary Vocabolario Treccani to their everyday life, in written comprehension practices, besides aiming at a lexicon acquisition and word application in the contexts of use. In addition, a tutorial was developed with the purpose of exploring the potentialities of using the Vocabolario Treccani. Finally, the contributions that an online electronic dictionary may bring to the foreign language learner goes from a directed use inside the classroom by the teacher until the learner"s autonomy in the lexical research activities.