| normal | <microscopy> An imaginary line forming a right angle with the tangent to a curved surface at a particular point. It is used as a basis for determining angles of incidence, reflection, and refraction. (05 Aug 1998) |
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| normal animal | In research, an experimental animal that has neither suffered an attack of a particular disease nor received an injection of a specific microorganism or its toxin. (05 Mar 2000) |
| normal antibody | Antibody demonstrable in the serum or plasma of various persons or animals not known to have been stimulated by specific antigen, either artificially or as the result of naturally occurring contact. Synonym: natural antibody. (05 Mar 2000) |
| normal antitoxin | Serum that is capable of neutralizing an equivalent quantity of a normal toxin solution. (05 Mar 2000) |
| normal bite | That arrangement of teeth and their supporting structure which is usually found in health and which approaches an ideal or standard arrangement. Synonym: normal bite. Synonym: neutral occlusion. (05 Mar 2000) |
| normal butyric acid | (also written as n-butyric acid), butanoic acid, CH3CH2CH2COOH, which occurs in combination with glycerol in cow's butter; and isobutyric acid, 2-methylpropanoic acid, (CH3)2CHCOOH, one of the intermediates in valine catabolism, found in combination with glycerol in croton oil and elsewhere. (05 Mar 2000) |
| normal cholesteraemic xanthomatosis | histiocytosis |
| normal distribution | Continuous frequency distribution of infinite range. Its properties are as follows: 1) continuous, symmetrical distribution with both tails extending to infinity; 2) arithmetic mean, mode, and median identical; and 3) shape completely determined by the mean and standard deviation. (12 Dec 1998) |
| normal electrical axis | A mean electrical axis of the heart situated between -30 |
| normal hearing | The ability to perceive sound normally. Synonym: normal hearing. Origin: G. Akousis, hearing (05 Mar 2000) |
| normal horse serum | The sterile and filtered serum of a healthy, unvaccinated horse. (05 Mar 2000) |
| normal human plasma | Sterile plasma obtained by pooling approximately equal amounts of the liquid portion of citrated whole blood from eight or more adult humans who have been certified as free from any disease which is tranmissible by transfusion, and treating it with ultraviolet irradiation to destroy possible bacterial and viral contaminants. (05 Mar 2000) |
| normal human serum | Sterile serum obtained by pooling approximately equal amounts of the liquid portion of coagulated whole blood from eight or more persons who are free from any disease transmissible by transfusion. (05 Mar 2000) |
| normal human serum albumin | A sterile preparation of serum albumin obtained by fractionating blood plasma proteins from healthy persons; used as a transfusion material and to treat oedema due to hypoproteinaemia. Synonym: dried human albumin. (05 Mar 2000) |
| normal occlusion | That arrangement of teeth and their supporting structure which is usually found in health and which approaches an ideal or standard arrangement. Synonym: normal bite. Synonym: neutral occlusion. (05 Mar 2000) |