Thymus gland

thymus

[thahy-muhs]
noun, plural thymuses, thymi [thahy-mahy] . Anatomy.
a ductless, butterfly-shaped gland lying at the base of the neck, formed mostly of lymphatic tissue and aiding in the production of T cells of the immune system: after puberty, the lymphatic tissue gradually degenerates.
Also called thymus gland.


Origin:
1685–95; < Neo-Latin < Greek thýmos warty excrescence, thymus

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World English Dictionary
thymus (ˈθaɪməs)
 
n , pl -muses, -mi
a glandular organ of vertebrates, consisting in man of two lobes situated below the thyroid. In early life it produces lymphocytes and is thought to influence certain immunological responses. It atrophies with age and is almost nonexistent in the adult
 
[C17: from New Latin, from Greek thumos sweetbread]

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Etymonline
Word Origin & History

thymus
gland near the base of the neck, 1693, Mod.L., from Gk. thymos "a warty excrescence," used of the gland by Galen, lit. "thyme," probably so called because of a fancied resemblance to a bunch of thyme.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

thymus thy·mus (thī'məs)
n. pl. thy·mus·es

  1. A lymphoid organ that is located in the superior mediastinum and lower part of the neck and is necessary in early life for the normal development of immunological function.

  2. The thymus of a calf or lamb.

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American Heritage
Science Dictionary
thymus   (thī'məs)  Pronunciation Key 
An organ of the lymphatic system located behind the upper sternum (breastbone). T cells (T lymphocytes) develop and mature in the thymus before entering the circulation. In humans, the thymus stops growing in early childhood and gradually shrinks in size through adulthood, resulting in a gradual decline in immune system function.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
thymus gland [(theye-muhs)]

A gland located behind the breastbone that functions in the development of the immune system. The thymus is large in infancy and early childhood but begins to atrophy between ages eight and ten.

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