| concrement | A concretion; a deposit of calcareous material in a part. Origin: L. Con-cresco, to grow together (05 Mar 2000) |
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| concrescence | Synonym: coalescence. 2. In dentistry, the union of the roots of two adjacent teeth by cementum. Origin: see concrement (05 Mar 2000) |
| concrete | Solid, tangible. Origin: L. Concretus (18 Nov 1997) |
| concrete oils | Essential oils obtained by extraction with organic solvents; contain waxes and paraffins. (05 Mar 2000) |
| concrete operations | In the psychology of Piaget, a stage of development in thinking, occurring approximately between 7 and 11 years of age, during which a child becomes capable of reasoning about concrete situations. (05 Mar 2000) |
| concrete thinking | Thinking of objects or ideas as specific items rather than as an abstract representation of a more general concept, as contrasted with abstract thinking (e.g., perceiving a chair and a table as individual useful items and not as members of the general class, furniture). Creative thinking, productive thinking, with novel rather than routine elements and results. Magical thinking, the irrational equating of thinking with doing. Prelogical thinking, a concrete type of thinking, characteristic of children and primitives, to which schizophrenic persons are sometimes said to regress. Synonym: archaic-paralogical thinking, prelogical mind. (05 Mar 2000) |
| concretio cordis | Extensive adhesion between parietal and visceral layers of the pericardium with partial or complete obliteration of the pericardial cavity. Synonym: internal adhesive pericarditis, synechia pericardii. (05 Mar 2000) |
| concretion | 1. <chemistry> The act or process of making or becoming solid. 2. <ecology> A localised concentration of chemical compounds, (for example, calcium carbonate and iron oxide) in the form of a grain or nodule of varying size, shape, hardness and colour, concretions of significance in hydric soils are usually iron oxides and manganese oxides occurring at or near the soil surface, which have developed under conditions of fluctuating water tables. (05 Jan 1998) |
| concretization | Inability to abstract with an overemphasis on specific details; seen in mental disorders, such as dementia and schizophrenia, and also normally in children. Origin: L. Con-cresco, pp. -cretus, to grow together, harden (05 Mar 2000) |
| concurrent disinfection | Application of disinfective measures as soon as possible after discharge of infectious material from the body of an infected person, or after soiling of articles with such infectious discharges. (05 Mar 2000) |
| concurrent review | Review of the medical necessity of hospital or other health facility admissions, upon or within a short time following an admission, and periodic review of services provided during the course of treatment. (12 Dec 1998) |
| concurrent validity | An index of criterion-related validity used to predict performance in a real-life situation given at about the same time as the test or procedure; the extent to which the index from one test correlates with that of a nonidentical test or index; e.g., how well a score on an aptitude test correlates with the score on an intelligence test. (05 Mar 2000) |
| concussion | <neurology> A more serious form of head injury that is characterised by one or more of the following features: loss of consciousness, amnesia, seizure or a change in mentation. See: brain contusion. (05 Jan 1998) |
| concussion cataract | Traumatic cataract occurring with or without a hole in the lens capsule. (05 Mar 2000) |
| concussion myelitis | Traumatic myelopathy. (05 Mar 2000) |