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fossil  n 
1 
a a relic, remnant, or representation of a plant or animal that existed in a past geological age, occurring in the form of mineralized bones, shells, etc., as casts, impressions, and moulds, and as frozen perfectly preserved organisms 
b (as modifier) 
fossil insects  
2 Informal, derogatory 
a a person, idea, thing, etc., that is outdated or incapable of change 
b (as modifier) 
fossil politicians  
3  (Linguistics) a form once current but now appearing only in one or two special contexts, as for example stead, which is found now only in instead (of) and in phrases like in his stead 
4 Obsolete any rock or mineral dug out of the earth 
 (C17: from Latin fossilis dug up, from fodere to dig) 
derived fossil    n 
a fossil eroded from a sediment and redeposited in a younger sediment 
fossil energy    n 
heat energy released by burning fossil fuel 
fossil fuel    n 
any naturally occurring carbon or hydrocarbon fuel, such as coal, petroleum, peat, and natural gas, formed by the decomposition of prehistoric organisms 
index fossil    n 
a fossil species that characterizes and is used to delimit a geological zone, (Also called)  zone fossil 
living fossil    n 
an animal or plant, such as the coelacanth and ginkgo, belonging to a group most of whose members are extinct 
trace fossil    n 
the fossilized remains of a track, trail, footprint, burrow, etc., of an organism