thymus

n. gland in the neck that is involved in the production of immune system cells

This article discusses the bodily organ. For the herb genus Thymus, see Thyme. In human anatomy, the thymus is an organ located in the upper anterior portion of the chest cavity just behind the sternum. Hormones produced by this organ stimulate the production of certain infection-fighting cells. It is of central importance in the maturation of T cells.
See more at Wikipedia.org...

Thymus /thy·mus/ a bilaterally symmetrical lymphoid organ consisting of two pyramidal lobules situated in the anterior superior mediastinum, each [more]Thymus - Community and Resources

Noun
1. large genus of Old World mints: thyme
(synonym) genus Thymus
(hypernym) asterid dicot genus
(member-holonym) Labiatae, family Labiatae, Lamiaceae, family Lamiaceae, mint family
(member-meronym) thyme

Noun
1. a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age
(synonym) thymus gland
(hypernym) endocrine gland, endocrine, ductless gland
(part-holonym) neck, cervix

(n.)
The thymus gland.
  

(a.)
Of, pertaining to, or designating, the thymus gland.