अतिश्रेष्ठatiśreṣṭhamfn. superior to the best, best of all.
masculine, feminine and neuter; or adjective superior to the best, best of all.
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.