1
: preserved from a past geologic age
fossil plants
fossil water in an underground reservoir
2
: being or resembling a fossil
3
: of or relating to fossil fuel
fossil energy sources
1
: a remnant, impression, or trace of an organism of past geologic ages that has been preserved in the earth's crust compare living fossil
2
a
: a person whose views are outmoded : fogy
b
: something (such as a theory) that has become rigidly fixed
3
: an old word or word element preserved only by idiom (such as fro in to and fro)
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Merriam-Webster unabridged
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