Definition(s)
- 1: The process of segregating, elaborating, and releasing some material either functionally specialized (as saliva) or isolated for excretion (as urine).
2: A product of secretion formed by an animal or plant; especially: one performing a specific useful function in the organism.
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Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
See also Understanding Medical Terminology.