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internal secretion

noun
1.
(physiol) a secretion, esp a hormone, that is absorbed directly into the blood
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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internal secretion in Medicine

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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