Try searching the CSCD using the string: nibbodak* where you will find
a number of references in the Vinaya a.t.thakathaa, .tiikaa-s, etc. I
discovered that there was another occurence of the word through Budsir
(Sp), then looking it up in the PTS ed. of Sp but was puzzled as to
why it didn't show up in the CSCD search until I found that there was
this other spelling.