1. No longer in use; gone into disuse; disused; neglected; as, an obsolete word; an obsolete statute; applied chiefly to words, writings, or observances.

2. <biology> Not very distinct; obscure; rudimental; imperfectly developed; abortive.

Synonyms: Ancient, antiquated, old-fashioned, antique, old, disused, neglected. See Ancient.

Origin: L. Obsoletus, p.p. Of obsolescere. See Obsolescent.

(01 Mar 1998)