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 a markedly outdated or old-fashioned person or thing.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

---

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 a person, idea, thing, etc, that is outdated or incapable of change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

---

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

---

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.

---

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

Progress has been slow because their fossil record is limited and their genomes are complex.

From Science Daily • Apr. 1, 2026

"We already have a backlog of renewable energy projects that are waiting for grid connections," and the timelines are potentially "much shorter" than for fossil fuel projects.

From Barron's • Apr. 1, 2026

The investment in Voltify is one of several options Fortescue is exploring as it seeks to wean its own railroad off fossil fuels.

From The Wall Street Journal • Mar. 31, 2026

Solar power plays a major role in efforts to reduce dependence on fossil fuels and address climate change.

From Science Daily • Mar. 28, 2026

For two days we explored Rome, a city that is both a living organism and a fossil.

From "Educated" by Tara Westover

Related Words

• relic
• skeleton
• specimen
• trace