obsolete

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Related to obsoletism: archaistic

obsolete

(ŏb′sə-lēt′, ŏb′sə-lēt′)
adj.
Biology Vestigial or rudimentary, especially in comparison with related or ancestral species, as the tailbone of an ape. Used of an organ or other part of an organism.

ob′so·lete′ly adv.
ob′so·lete′ness n.
ob′so·let′ism n.

obsolete

outdated, or no further use, gradually disappearing.