Dictionary
thy•mus
Pronunciation: (thī'mus), [key]—
n.,
—pl. -mus•es, -miPronunciation: (-mī). [key]
Anat.
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
thy'mus gland". Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.