fossil

American  

[fos-uhl] / ˈfɒs əl /

noun

1. any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc.

2. a markedly outdated or old-fashioned person or thing.

3. a linguistic form that is archaic except in certain restricted contexts, as nonce in for the nonce, or that follows a rule or pattern that is no longer productive, as the sentence So be it.

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adjective

1. of the nature of a fossil.

   fossil insects.

2. belonging to a past epoch or discarded system; antiquated.

   a fossil approach to economics.

fossil British  

/ ˈfɒsəl /

noun

1. 1. a relic, remnant, or representation of an organism that existed in a past geological age, or of the activity of such an organism, occurring in the form of mineralized bones, shells, etc, as casts, impressions, and moulds, and as frozen perfectly preserved organisms

   2. ( as modifier )

      fossil insects

2. informal

   1. a person, idea, thing, etc, that is outdated or incapable of change

   2. ( 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

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fossil Scientific  

/ fŏs′əl /

1. The remains or imprint of an organism from a previous geologic time. A fossil can consist of the preserved tissues of an organism, as when encased in amber, ice, or pitch, or more commonly of the hardened relic of such tissues, as when organic matter is replaced by dissolved minerals. Hardened fossils are often found in layers of sedimentary rock and along the beds of rivers that flow through them.

2. See also index fossil microfossil trace fossil

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fossil Cultural  

1. The evidence in rock of the presence of a plant or an animal from an earlier geological period. Fossils are formed when minerals in groundwater replace materials in bones and tissue, creating a replica in stone of the original organism or of their tracks. The study of fossils is the domain of paleontology. The oldest fossils (of bacteria) are 3.8 billion years old.

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Discover More

The term is used figuratively to refer to a person with very old-fashioned or outmoded viewpoints: “That old fossil thinks that men should wear suits at the theater!”

Other Word Forms

• fossillike adjective
• subfossil noun

Etymology

Origin of fossil

First recorded in 1555–65; from Latin fossilis “dug up,” from foss(us) “dug” (past participle of fodere “to dig”) + -ilis -ile ( def. ); replacing earlier fossile, from French

Example Sentences

Although a major oil and gas producer, Iran sought to revive the project in the late 1980s to diversify its energy resources and reduce its dependence on fossil fuels for domestic consumption.

From Barron's • Apr. 4, 2026

That includes increased demand on electricity grids that are often reliant on fossil fuels, and on local water supplies used to cool the hot servers inside.

From Barron's • Apr. 3, 2026

But for now, most in Europe still rely on fossil fuel imports.

From BBC • Apr. 3, 2026

This fossil captures a key moment in the evolution of chelicerates.

From Science Daily • Apr. 3, 2026

Cory catalogued each of them and rated the likelihood of each one being a fossil.

From "The Season of Styx Malone" by Kekla Magoon

Related Words

• relic
• skeleton
• specimen
• trace