| negative pathognomonic symptom |
A symptom that never occurs in a certain disease or condition; hence, its occurrence rules out the existence of that disease.
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| negative pressure drainage |
Drainage in which negative pressure is maintained in the tube. It is used in treating pneumothorax and in certain types of drains or catheters in the intestinal tract, body cavity, or surgical wound. SYN: suction d
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| negative selection |
The process by which immature T lymphocytes (thymocytes) with receptors for self-antigens are destroyed in the thymus. This is part of the mechanism that prevents autoimmune diseases. SEE: autoimmunity.
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| negative sign |
Minus sign (?) used in subtraction, to denote something that is below zero, or to indicate a lack.
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| negative study |
An investigation in which no benefit of a treatment, or no association between a risk factor and an outcome, is demonstrated; also called negative trial. Such studies may be important in disproving misconceptions about a disease,
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