lymphoid tissue

https://doi.org/10.1351/goldbook.13414
Vertebrate tissue that is made up predominantly of lymphocytes, e.g., lymph, lymph nodes, spleen, thymus, Peyer’s patches, adenoids, pharyngeal tonsils, and, in birds, bursa of Fabricius and cecal tonsils.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1206 [Terms] [Paper]