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thyroid gland
thyroid hormone
thyroid-stimulating hormone
thyroidectomy
thyroiditis
thyrotoxicosis
thyrotropin
thyrotropin-releasing hormone
thyroxine
thyrse
thyrsus
thysanuran
thyself
THz
Ti
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thymus

thy·mus [ thməss ] (plural thy·mus·es or thy·mi [ th m ]) or thy·mus gland (plural thy·mus glands)


noun 
Definition:
 
organ of immune system: an organ, located at the base of the neck, that is involved in development of cells of the immune system, particularly T cells. It is prominent in the young but shrinks after puberty.

[Late 16th century. Via modern Latin< Greek thumos "warty growth resembling a bunch of thyme" < thumon (see thyme)]
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