Meaning of FOSSIL in English

[noun] [C] - a bone, a shell or the shape of a plant or animal which has been preserved in rock, ice or earth for a very long perioda collection of fossilsa fossil skeletona fossil hunter(informal) People who are not willing to accept change are sometimes called (old) fossils.Fossil fuels are fuels such as gas, coal and oil, which are produced from ancient plant material.

Cambridge English vocab.      Кембриджский английский словарь.