Senses marked archaic or obsolete — still readable, no longer current. Membership is computed from data the entry already carries, applied to every entry in the corpus, so the list regenerates correctly whenever the corpus changes.
No entry in the corpus currently matches this rule. The collection is kept rather than deleted because the rule is real — WordNet simply carries no sense with that label in the release we build from. Nothing here is a placeholder for words we have not got around to adding.
Definitions, subject classification and semantic relations come from WordNet. Syllable counts come from the CMU Pronouncing Dictionary where the word is recorded in it. Full sources and licences.