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Definition of: secretion
(si·krē′shən) noun
1. Biol. The process by which materials are separated from blood or sap and elaborated into new substances: the secretion of milk, gastric juice, or urine. Secretion in animals is generally performed by glandular epithelial cells. Compare EXCRETION.
2. The substance secreted, as saliva or milk.
3. The act of concealing.
4. A deposit of mineral matter in successive coatings, filling cavities, and fissures.
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