internal secretion

World English Dictionary
internal secretion
 
n
physiol a secretion, esp a hormone, that is absorbed directly into the blood

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American Heritage
Medical Dictionary

internal secretion n.
A secretion that is produced by an endocrine gland and discharged directly into the bloodstream; a hormone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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