(physiology, transitive, of organs, glands, etc.) To extract a substance from blood, sap, or similar to produce and emit waste for excretion or for the fulfilling of a physiological function.
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Why one set of cells should secrete bile, another urea, and so on, we do not know.
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1842, William Benjamin Carpenter, Principles of Human Physiology:
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Many tumors secrete two or more different hormones.