यज्ञसंस्तरyajñasaṃstara(see संस्त् ˚, p. 1121)
(see संस्त् that the rest of a word is to be supplied, page and participle 1121)
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.