endocrine gland

noun
any of various glands, as the thyroid, adrenal, and pituitary glands, that secrete certain substances or hormones directly into the blood or lymph; ductless gland.

Origin:
1910–15

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Collins
World English Dictionary
endocrine gland
 
n
Also called: ductless gland any of the glands that secrete hormones directly into the bloodstream, including the pituitary, pineal, thyroid, parathyroid, adrenal, testes, ovaries, and the pancreatic islets of Langerhans

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

endocrine gland n.
Any of various ductless glands, such as the thyroid, adrenal, or pituitary, having hormonal secretions that pass directly into the bloodstream. Also called ductless gland.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
endocrine gland   (ěn'də-krĭn, -krēn')  Pronunciation Key 
A gland of the body that produces hormones and secretes them directly into the bloodstream. In mammals, the thyroid gland, adrenal glands, and pituitary gland, as well as the ovaries, testes, and the islets of Langerhans of the pancreas are endocrine glands.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
endocrine gland [(en-duh-krin, en-duh-kreen, en-duh-kreyen)]

A gland that secretes hormones directly into the blood. These glands make up the endocrine system.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

endocrine gland

any of the systems found in animals for the production of hormones, substances that regulate the functioning of the organism. Such a system may range, at its simplest, from the neurosecretory, involving one or more centres in the nervous system, to the complex array of glands found in the human endocrine system.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The pituitary gland is a pea-sized endocrine gland located at the base of the brain.
Blood tests are used to evaluate the function of each endocrine gland.
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