wndb(5) on Linux
The text d5d75587dfa5, as Debian 3.0 (Woody) shipped it. The page shows this text now.
WordNet database files (default file names) noun.idx, noun.dat, verb.idx, verb.dat, adj.idx, adj.dat, adv.idx, adv.dat - WordNet database files (PC) noun.exc, verb.exc. adj.exc adv.exc - morphology exception lists sentidx.vrb, sents.vrb - files used by search code to display sentences illustrating the use of some specific verbs (The remainder of this manual page refers to database files by their default file names.)