आस्फुल्āsphul= आ-√स्फल् above.
Equivalent to आ-√स्फल् a reference to some preceeding word (not necessarily in the same page).
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.