Obsolescent Definition

In the process of becoming obsolete.
Webster's New World
Becoming reduced during the course of evolution; vestigial or nearly vestigial. Used of an organ or other part of an organism.
American Heritage Medicine

Origin of Obsolescent

  • Latin obsolēscēns obsolēscent- present participle of obsolēscere to fall into disuse ob- away ob– solēre to be accustomed to

    From American Heritage Dictionary of the English Language, 5th Edition

  • First attested circa 1780, from Latin obsolescentum.

    From Wiktionary

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