This paper analyses two Oscan words, attested in a recently discovered Iuvilas inscription. The words at issue are minnaris, occurring in the noun phrase fisiais minnaris (dat./abl.pl.) and suleis (gen.sg.), occurring in the noun phrase prs suleis bias. Minnaris (dat./abl.pl.), an attribute of fisia- < fēsiā- (= Lat. fēria) < *dheh₁s-i̯eh2- ‘festival’, is an āli-adjective from the IE stem *mēns-n- <*meh₁ns-n- ‘moon/month.’ It is likely to be traced back to a preform minna- < mēnā- <*meh₁n-eh2- or mēnnā- < *mēn-s-(n)-ā- <*meh₁n-s-(n)-eh2-, comparable with Lat. mena and Greek μήνη. In the context, the most suitable meaning is ‘moon’, We are thus entitled to identify the inherited term for ‘moon’ in Sabellian, inflected as an ā-stem as in Latin and Greek. As for suleis (gen.sg. of a consonant stem), it represents the Oscan (and more generally Sabellian) outcome of PIE *séh₂ul/n- ‘sun’. Just like Latin sōl, the Oscan word raises some problems concerning the rendering of the root vowel. Both lexical items point to a common Proto-Italic preform. The meanings of these words are consistent with the sense required by the context of calendar dates connected with religious festivals that are usually mentioned in this type of text.