animal tissue - the tissue in the bodies of animals

faucial tonsil, palatine tonsil, tonsil, tonsilla - either of two masses of lymphatic tissue one on each side of the oral pharynx

spleen, lien - a large dark-red oval organ on the left side of the body between the stomach and the diaphragm; produces cells involved in immune responses

lymphatic system, systema lymphaticum - the interconnected system of spaces and vessels between body tissues and organs by which lymph circulates throughout the body

lymph gland, lymph node, node - the source of lymph and lymphocytes

adenoid, Luschka's tonsil, pharyngeal tonsil, third tonsil, tonsilla adenoidea, tonsilla pharyngealis - a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx); "hypertrophy of the pharyngeal tonsils is called adenoids"; "enlarged adenoids may restrict the breathing of children"