Definition of concretion in English:



  • 1A hard solid mass formed by the local accumulation of matter, especially within the body or within a mass of sediment.

    ‘a mass of small concretions, each built up layer upon layer around some small nucleus’
    • ‘At certain levels, carbonate-rich beds are present, inside which decimetre-scale hard calcareous concretions develop.’
    • ‘Large chert concretions appear 8 m above the base of the unit at Muller Canyon whereas at Reno Draw they do not appear until 18 m above the base.’
    • ‘Coal balls are a particular type of carbonate concretion that has been long known for the superb preservation of plant material.’
    • ‘The mudstones are dark and contain calcareous concretions, the latter brecciated and with calcareous veins.’
    • ‘Asbestos bodies are asbestos fibers that have been coated with an iron-rich, proteinaceous concretion.’
    • ‘They sometimes are found together with dolostone concretions, barite nodules, or phosphatic nodules.’
    • ‘These are found rarely in large septarian concretions in the Huron Shale in north-central Ohio near Milan, in Huron County.’
    • ‘The authors show that early concretion growth prevented collapse and infilling of voids in the organisms, in the time-interval between organic decay and precipitation of calcite.’
    • ‘To make matters worse, the concretions can be associated with cycads.’
    • ‘Eventually, the sandstone slowly eroded away and the hard, erosion-resistant concretions were left on the ground.’
    • ‘The biomineralized shells of trilobites, gastropods and brachiopods are preserved within the concretions.’
    • ‘Recently, one of us saw a bin of silicified barite concretion fragments in a Utah rock shop that were being sold as cycad specimens.’
    • ‘Preservation of non-biomineralized tissues within concretions occurs through most of the Phanerozoic, from the Upper Cambrian to the Recent.’
    • ‘This spike has been previously regarded as diagenetic, as the samples analysed correspond to limestone concretions.’
    • ‘Most specimens are contained in concretions and are preserved only because the concretions formed around them.’
    • ‘Septarian concretions, some as much as 6 feet in diameter, occur in the Mancos Shale north of the town of Grand Junction where the land slopes upward toward the base of the Book Cliffs.’
    • ‘The barite and calcite form excellent euhedral crystals in concretions within the Cretaceous-age Mancos Shale.’
    • ‘A nodule is a type of concretion with a rough and knobby surface.’
    • ‘Coal balls are concretions of permineralized peat formed in place.’
    • ‘The bodies of many smaller concretions are surrounded by a shell of fine-grained pyrite.’
    bodywork, hull, fuselage, outer casing
    View synonyms
    1. 1.1The process by which matter forms into a concretion.
      • ‘The point of such criticisms is not to recommend a ‘materialist’ poetics supposedly granting direct access to a realm of concretion undisturbed by concepts.’
      • ‘These ground rules become privatized, and those who represent state security become complicit in their support, creating disorder and the absence of clear references for legitimacy and concretion for the general interest.’
      • ‘In its conception and concretion, the Otter Creek feeding facility was a monument to Horace Albright's philosophy of aesthetic conservation.’
      • ‘Strenuous efforts at concretion confront the inevitability of mutability.’
      • ‘The areas along fault planes were subjected to a shearing action that produced a pattern of fracturing that is different from the desiccation cracking of a normal septarian concretion.’
      • ‘In Smithson's work, seriality involves not pure repetition or reiteration (he is not prone to setting up series of identical objects) but rather accretion, concretion, and diminution.’
      • ‘Taken together, they impart a kind of tenuous concretion to the vague concept of nationhood.’
      • ‘The concern with material concretion begins with Bernstein's title, With Strings.’
      • ‘Yuki's face scrunched up in concretion.’


Mid 16th century: from Latin concretio(n-), from concrescere grow together.