केशारुकाkeśārukāf. for कशेर्˚, the back-bone L. Sch.
feminine for कशेर्that the rest of a word is to be supplied, the back-bone Lexicographers Scholiast or Commentator
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.