Our study aims to analyse the set of Istro-Romanian terms that fall into the semantic field of celestial bodies and atmospheric phenomena. We analyse a corpus of Istro-Romanian words extracted from Goran Filipi's atlas of Istro-Romanian. These terms represent the linguistic realizations of some notions that belong to the conceptual field of celestial space as a whole, but also to the elements that populate it and to the atmospheric phenomena inherent in this environment. The Istro-Romanian terms are investigated from an etymological perspective and, through the high or low degree of generality of the notions they define, reflect certain tendencies of linguistic representation from an etymological point of view: the non-specialised vs. specialised conceptual relationship is expressed linguistically, at the level of the semantic field analysed, in many of the cases presented, by the inherited term - borrowed term lexical relationship. The generally observable, but not exclusive, tendency at the level of this semantic field in the vocabulary of Istro-Romanian is that of naming a generic notion by a term inherited from Latin and taking a loanword from Croatian or Italian to designate specialized notions.