उपपौर्णमासिupapaurṇamāsiमासम् [māsam], मासम् ind. just preceding or at the time of the full-moon day.
मासम् māsam, मासम् Indeclinable just preceding or at the time of the full-moon day.
कोशःDictionaries
Every entry for a word in Apte, Monier-Williams, Macdonell and the Dhātupāṭha, with their abbreviations spelled out, and an analysis of its forms.