/thuy"meuhs/ , n. , pl. thymuses, thymi /-muy/ . 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 thymus gland .
[ 1685-95; thýmos warty excrescence, thymus ]