
1) Ductless gland
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https://www.crosswordclues.com/clue/endocrine-gland

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus, gastrointestinal tract and adrenal glands. The ...
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http://en.wikipedia.org/wiki/Endocrine_gland

A gland that furnishes an internal secretion, usually having an effect on another organ.
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http://www.aans.org/Media/Glossary-of-Terminology

a group of specialized cells that release hormones into the blood. For example, the islets in the pancreas, which secrete insulin, are endocrine glands.
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http://www.diabetes.co.uk/glossary/e.html

a group of specialized cells that release hormones into the blood. For example, the islets in the pancreas,
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http://www.diabetes.org

Organs or gland that secrete regulatory substances directly into the circulation and not through a duct. ... Examples are pituitary, thyroid, parathyroid, adrenal glands, ovary and testis, placenta and beta cells of pancreas. ... (27 Sep 1997) ...
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http://www.encyclo.co.uk/local/20973

A gland that produces a secretion – often a hormone - and releases it directly into the bloodstream.
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http://www.encyclo.co.uk/local/21474

A group of specialised cells that release hormones into the blood. For example, the islets in the pancreas, which secrete insulin, are endocrine glands.
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http://www.encyclo.co.uk/visitor-contributions.php

(Humans as organisms) one of the glands which secrete hormones into the bloodstream
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http://www.encyclo.co.uk/visitor-contributions.php

Gland that secretes directly into blood and not through a duct. Examples are pituitary, thyroid, parathyroid, adrenal glands, ovary and testis, placenta and B cells of pancreas.
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http://www.encyclo.co.uk/visitor-contributions.php

Endocrine gland: A gland that secretes a substance (a hormone) into the bloodstream. The endocrine glands are 'glands of internal secretion.' They include the hypothalamus, pituitary gland, pineal gland, thyroid, parathyroid glands, heart (which makes atrial-natriuretic peptide), the stomach and intestines, islets of Langerhans in the pancreas, the...
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http://www.medterms.com/script/main/art.asp?articlekey=39880

(en;duo-krin) A ductless, hormone-producing gland that is part of the endocrine system.
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http://www.mhhe.com/biosci/abio/glossary.mhtml

An endocrine gland is one which secretes hormones into the body.
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http://www.probertencyclopaedia.com/browse/EE.HTM

A gland that secretes hormones into the body.
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http://www.quick-facts.co.uk/medicene/anatomy.htm

A group of specialized cells that release hormones into the blood. For example, the islets in the pancreas, which secrete insulin, are endocrine glands.
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http://www.shieldhealthcare.com/community/diabetes/2011/06/30/diabetes-glos

[
n] - any of the glands of the endocrine system that secrete hormones directly into the bloodstream
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http://www.webdictionary.co.uk/definition.php?query=endocrine%20gland

a gland that secretes hormones into the bloodstream
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https://www.encyclo.co.uk/local/20875
endocrine 1 ductless gland noun any of the glands of the endocrine system that secrete hormones directly into the bloodstream
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https://www.encyclo.co.uk/local/20974

Gland that secretes hormones into the bloodstream to regulate body processes. Endocrine glands are most highly developed in vertebrates, but are also found in other animals, notably insects. In humans the main endocrine glands are the pituitary, thyroid, parathyroid, adrenal, pancreas, ovary, and tes...
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https://www.encyclo.co.uk/local/21221
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