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A secretion that is produced by an endocrine gland and discharged directly into the bloodstream; a hormone.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
An outdated term for the secretion of an endocrine gland.
See also: secretion
Medical Dictionary, © 2009 Farlex and Partners
internal secretionAny secretion absorbed directly into the blood rather than passed out on to an internal surface or to the exterior.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005