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amber a hard, yellow or brown material that is used to make jewelry. It is a fossil that comes from the resin of pine trees. [1/2 definitions]
fossil A fossil is something left behind by a living thing that lived on the earth a very long time ago. Sometimes a fossil is a part of an animal's body, like a bone from a dinosaur or a backbone of a fish. Sometimes it is a pattern formed by things like shells or leaves or animal tracks that you can see in the surface of a rock. It is the rock itself that has preserved these things so that we can see them now, even after such a long time.
fossil fuel any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuels.