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one of the spherical masses of lymphoid cells, frequently having a more lightly staining center. See: solitary lymphoid nodules, aggregated lymphoid nodules of the small intestine.
Small, unencapsulated aggregations of immune cells in the submucosa of the respiratory, intestinal, and genitourinary epithelia; examples are tonsils and Peyer's patches.Synonym: lymph nodule
See also: lymphoid