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|Noun||1.||thymus gland - a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age|
ductless gland, endocrine gland, endocrine - any of the glands of the endocrine system that secrete hormones directly into the bloodstream
immune system - a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response
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