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 a markedly outdated or old-fashioned person or thing.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 a person, idea, thing, etc, that is outdated or incapable of change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

Derived 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

Explanation

Fossils are the really, really old remains of a plant or animal — so old they've turned to stone. Fossil is also an insult for an old or old-fashioned person. Fossils are very important to scientists who study animals: they're one of the ways we learn about the beasts and critters of the past. A fossil is an imprint of the bones of that animal in rock or stone. If you see a reconstruction of a dinosaur in a museum, scientists used fossils to figure out how it should look. Also, calling someone a fossil is like calling them a geezer or old fogey. It's not a compliment.

Example Sentences

The fossil was given the name Ikawaihere koehleri in honor of Richard Köhler and the location where it was discovered.

From Science Daily • Jun. 12, 2026

"This enabled us to get enough specific locality information to prepare a Fossil Record Form and to scientifically catalogue the fossil," Daphne says.

From Science Daily • Jun. 12, 2026

However, work on the study could not move forward because researchers lacked the detailed field information needed to properly document where and how the fossil had been found.

From Science Daily • Jun. 12, 2026

Scientists fear it will exacerbate the heat of a planet already warming from burning fossil fuels, while amping up weather extremes.

From Barron's • Jun. 11, 2026

He said there were so many untapped sources of energy in the world that it was ridiculous to be burning all that fossil fuel.

From "The Glass Castle" by Jeannette Walls

Related Words

• relic
• skeleton
• specimen
• trace