1. A number of similar or related objects. 2. In chemistry, a radical. For individual chemical groups, see the specific name.
- blood g. blood g..
- characterizing g. a g. of atoms in a molecule that distinguishes the class of substances in which it occurs from all other classes; thus carbonyl (CO) is the characterizing g. of ketones; COOH, of organic acids, etc.
- connective tissue g. a collective name for mucous tissue, dentin, bone, cartilage, and ordinary connective tissue, all derived from the mesenchyme.
- control g. a g. of subjects participating in the same experiment as another g. of subjects, but which is not exposed to the variable under investigation. SEE ALSO: experimental g..
- cytophil g. the part of an antibody that binds it to the cell.
- determinant g. SYN: antigenic determinant.
- diagnosis-related g. (DRG) a scheme for billing for medical and especially hospital services by combining diseases into groups according to the resources needed for care, arranged by diagnostic category. A dollar value is assigned to each g. as the basis of payment for all cases in that g., without regard to the actual cost of care or duration of hospitalization of any individual case, as a mechanism to motivate health-care providers to economize.
- encounter g. a form of psychological sensitivity training that emphasizes the experiencing of individual relationships within the g. and minimizes intellectual and didactic input; the g. focuses on the present rather than concerning itself with the past or outside problems of its members. SEE ALSO: sensitivity training g..
- experimental g. a g. of subjects exposed to the variable of an experiment, as opposed to the control g..
- HACEK g. a g. of Gram-negative bacteria that includes Haemophilus spp., Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae. Bacteria in this g. have in common a culture requirement of an enhanced carbon dioxide atmosphere and ability to infect human heart valves.
- linkage g. a set of two or more loci that have been shown by linkage analysis to be physically close in the genome but that have not yet been assigned to specific chromosomes. It is rapidly becoming an outmoded term.
- matched groups a method of experimental control in which subjects in one g. are matched on a one-to-one basis with subjects in other groups concerning all organism variables ( e.g., age, sex, height, weight) which the experimenter believes could influence the variable being investigated.
- prosthetic g. a non-amino acid compound attached to a protein, often in a reversible fashion, that confers new properties upon the conjugated protein thus produced. SEE ALSO: coenzyme.
- sensitivity training g. a g., more popular in the 1960s and 1970s, in which members seek to develop self-awareness and an understanding of g. processes rather than to obtain therapy for an emotional disturbance. SEE ALSO: encounter g., personal growth laboratory.
- T g. abbreviation for training g..
- therapeutic g. any g. of patients meeting together for mutual psychotherapeutic, personal development, and life change goals.
- training g. (T g.) any g. emphasizing training in self-awareness and g. dynamics. See sensitivity training g..

* * *

group 'grüp n, often attrib
1) a number of individuals assembled together or having some unifying relationship
2 a) an assemblage of related organisms often used to avoid taxonomic connotations when the kind or degree of relationship is not clearly defined
b ) (1) an assemblage of atoms forming part of a molecule esp FUNCTIONAL GROUP (2) an assemblage of elements forming one of the vertical columns of the periodic table

* * *

(grp) 1. an assemblage of objects or individuals having certain qualities in common; see also population. 2. a number of atoms forming a recognizable and usually a transferable portion of a molecule.

Medical dictionary. 2011.

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