wndb(5) on Linux
The text 32666608fa23, as Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.
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 cousin.tops, cousin.exc - files used by search code to group similar senses cousin.tps, cousin.exc - files used by search code to group similar senses (PC) 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.)