Last Updated：2025/11/20
(anatomy, immunology) A ductless gland, consisting mainly of lymphatic tissue, located behind the top of the breastbone. It is most active during puberty, after which it shrinks in size. It plays an important role in the development of the immune system and produces lymphocytes.
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thymus
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Source Word
thymus
IPA(Pronunciation)
Noun
Japanese Meaning
胸腺（きょうせん）: 免疫系の発達に重要な役割を果たすリンパ組織からなる管状ではない腺。胸骨の上部の後ろに位置し、主に思春期前に活発に働き、その後は縮小する。
（ plural ）
