- no longer in use or practice; discarded
- no longer in fashion; out-of-date; passé
- Biol. rudimentary or poorly developed as compared with its counterpart in other individuals of a related species, the opposite sex, etc.; vestigial: said of an organ, etc.
L obsoletus, pp. of obsolescere, to go out of use < ob- (see ob-) + *-solescere (< exolescere, to grow out of use < ex-, ex- + ? alescere, to increase: see adolescent)
transitive verb obsoleted, obsoleting
to make obsolete, as by replacing with something newer