This paper presents a terminological research carried out to account for terms of the environment in Brazilian Portuguese based on a lexico-semantic perspective for Terminology (L’Homme, 2015, 2016, 2017, 2020; L’Homme et al., 2014, 2020). This work takes place in the context of a collaboration for the development of DiCoEnviro (Dictionnaire Fondamental de l’Environnment – Fundamental Dictionary on the environment), a multilingual terminological resource developed by the Observatoire de Linguistique Sens Texte at the University of Montreal, Canada. By following a methodolgy especially devised to develop terminological work based on a lexicon-driven approach (L’Homme et al., 2020), the terminological analysis reveals how the linguistic behavior of terms may be unveiled and how this is effective for identifying the meaning of a term and supporting meaning distinctions.