DictionarythymusImmune development gland
noun

thymus

THYE-mus/ˈθaɪməs/

A gland near the breastbone where certain immune cells mature.

The thymus helps T cells mature and protect the body.

Medical illustration of upper torso with a small paired pink thymus behind the sternum above the heart, lungs lightly ghosted, no labels.
Etymology

Greek thymos literally meant “thyme” and was also used for a warty growth. The gland was probably named for a fancied resemblance to a thyme bud.

In context

More Than Skin Deep2:50
in young children there's a small organ here called the thymus which helps in the development of the immune system
The Mediastinum

More examples

  • The thymus sits behind the upper part of the breastbone.
  • After puberty, the thymus gradually shrinks.
  • The scan shows an enlarged thymus.

Forms

thymus · thymuses · thymi

thymic adjective — Relating to the thymus gland.