thymus development
The process whose specific outcome is the progression of the thymus over time, from its formation to the mature structure. The thymus is a symmetric bi-lobed organ involved primarily in the differentiation of immature to mature T cells, with unique vascular, nervous, epithelial, and lymphoid cell components.
GO:0048534
hematopoietic or lymphoid organ development
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GO:0048732
gland development
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