fossil

/หˆfษ‘หsษ™l/
noun
  1. 1

    The mineralized remains of an animal or plant.

  2. 2

    Any preserved evidence of ancient life, including shells, imprints, burrows, coprolites, and organically-produced chemicals.

  3. 3

    A fossil word.

  4. 4

    Anything extremely old, extinct, or outdated.

Source: https://en.wiktionary.org/wiki/fossil