Medical Definition of indirect
1: not direct: asa: not resulting directly from an action or cause (as a disease) <indirect effects of malaria>b: involving intermediate or intervening parts or pathways <stimulation of one eye elicits narrowing of the pupil of the other eye by an indirect reaction> <indirect attachment of a muscle through tendons>
2: involving or being immunofluorescence in which antibodies of two kinds are used of which the first combine with a specific protein and the second contain a fluorescent label and combine with the antibodies of the first type
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