con·​cre·​tion | \ kän-ˈkrē-shən How to pronounce concretion (audio) , kən- \

Definition of concretion

1 : something concreted: such as
a : a hard usually inorganic mass (such as a bezoar or tophus) formed in a living body
b : a mass of mineral matter found generally in rock of a composition different from its own and produced by deposition from aqueous solution in the rock
2 : the act or process of concreting : the state of being concreted concretion of ideas in a hypothesis

Other Words from concretion

concretionary \ kän-​ˈkrē-​shə-​ˌner-​ē How to pronounce concretion (audio) , kən-​ \ adjective

Examples of concretion in a Sentence

Recent Examples on the Web This fossil was preserved in a concretion—a sedimentary structure that tends to form around fossil material—and was discovered by chance at the end of a frustratingly fruitless series of digs. Jeanne Timmons, Ars Technica, 6 June 2022 The complete shape of sharks could be represented in the fossils, Colleary said, because of the way they were encased in a mineral formation called a concretion. Peter Krouse, cleveland, 7 Feb. 2022 But paleontologists can also search for concretions, or rocks that form around cores of ancient bone. National Geographic, 24 Oct. 2019 Rhinoliths are stone-like concretions formed by the gradual buildup of salts around things not normally found in the nose. Beth Mole, Ars Technica, 31 Oct. 2019 Patients suffering from the concretions typically present with a variety of symptoms, including nasal obstruction, headaches, facial pain and discharge from the nose. Matthew Robinson, CNN, 31 Oct. 2019 Preserved in hardened concretions of stone lie the remains of turtles, crocodiles, and most of all, mammals that lived in this place during the first million years after the terrible impact that triggered the extinction of the dinosaurs. Riley Black, Smithsonian, 25 Oct. 2019 If there’s one concretion with fossils inside, there’s got to be more. New York Times, 24 Oct. 2019 These small, mineral hematite-rich concretions are near Fram Crater, visited by NASA's Opportunity rover in April 2004. Ashley Strickland, CNN, 20 Aug. 2019 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'concretion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of concretion

1541, in the meaning defined at sense 1

History and Etymology for concretion

borrowed from Latin concrētiōn-, concrētiō "formation into something solid," from concrē-, stem of concrēscere "to coalesce, condense, solidify, harden" + -tiōn-,-tiō, suffix of verbal action — more at concrescence

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The first known use of concretion was in 1541

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concrete universal



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Last Updated

17 Jun 2022

Cite this Entry

“Concretion.” Dictionary, Merriam-Webster, Accessed 8 Aug. 2022.

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More Definitions for concretion


con·​cre·​tion | \ kän-ˈkrē-shən, kən- How to pronounce concretion (audio) \

Medical Definition of concretion

: a hard usually inorganic mass (as a tophus) formed especially from mineral salts in a living body

More from Merriam-Webster on concretion

Thesaurus: All synonyms and antonyms for concretion Encyclopedia article about concretion


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