from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The process of secreting a substance, especially one that is not a waste, from the blood or cells: secretion of hormones; secretion of milk by the mammary glands.
  • n. A substance, such as saliva, mucus, tears, bile, or a hormone, that is secreted.
  • n. The act of concealing something in a hiding place.
  • n. The act of stealing something secretly.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any substance that is secreted by an organism.
  • n. The act of secreting a substance, especially from a gland.
  • n. The act of hiding something.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of secreting or concealing.
  • n. The act of secreting; the process by which material is separated from the blood through the agency of the cells of the various glands and elaborated by the cells into new substances so as to form the various secretions, as the saliva, bile, and other digestive fluids. The process varies in the different glands, and hence are formed the various secretions.
  • n. Any substance or fluid secreted, or elaborated and emitted, as the gastric juice.

from The Century Dictionary and Cyclopedia

  • n. In physiology:
  • n. In animal physiology, the process of preparing and separating substances by glandular activity.
  • n. In vegetable physiology, the process by which substances are separated from the sap of vegetables.
  • n. A substance or product secreted, or elaborated and emitted.
  • n. Synonyms Excretion, Secretion. See excretion.
  • n. A mineral deposit formed in a fissure or cavity by growth inward from the walls: contrasted with concretion, which grows outward from a nucleus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the organic process of synthesizing and releasing some substance
  • n. a functionally specialized substance (especially one that is not a waste) released from a gland or cell


French sécrétion, from Old French, separation, from Latin sēcrētiō, sēcrētiōn-, from sēcrētus, past participle of sēcernere, to set aside; see secern.
From secrete2.
(American Heritage® Dictionary of the English Language, Fourth Edition)
1646, from French sécrétion, from Latin secretionem (Wiktionary)



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