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1. either of two small masses of lymphatic tissue situated one on each side of the back of the mouth
2. Anatomy any small rounded mass of tissue, esp lymphatic tissue
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


Localized aggregation of diffuse and nodular lymphoid tissue found in the region where the nasal and oral cavities open into the pharynx. The tonsils are important sources of blood lymphocytes. They often become inflamed and enlarged, necessitating surgical removal.

The two palatine (faucial) tonsils are almond-shaped bodies measuring 1 by 0.5 in. (2.5 by 1.2 cm) and are embedded between folds of tissue connecting the pharynx and posterior part of the tongue with the soft palate. These are the structures commonly known as the tonsils. The lingual tonsil occupies the posterior part of the tongue surface. It is really a collection of 35–100 separate tonsillar units, each having a single crypt surrounded by lymphoid tissue. Each tonsil forms a smooth swelling about 0.08– 0.16 in. (2–4 mm) in diameter. The pharyngeal tonsil (called adenoids when enlarged) occupies the roof of the nasal part of the pharynx. This tonsil may enlarge to block the nasal passage, forcing mouth breathing. See Lymphatic system

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.


Localized aggregation of diffuse and nodular lymphoid tissue found in the throat where the nasal and oral cavities open into the pharynx.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
We collected samples of kidney and cecal tonsils from affected chickens in the field that died and submitted them to the Scientific Support and Investigation Laboratory of Ceva-Phylaxia (Budapest, Hungary) for detection of possible viral agents.
In our previously developed avian models, H9N2- infected 3 weeks-old chickens displayed a high level of virus shedding from trachea and cecal tonsil cells on day 5 post-infection (data not shown).
Day-of-hatch chicks inoculated with SE had no SE detected in their cecal tonsils when supplemented with probiotics for 24 h (Higgins et al., 2010) or for 3 d (Chen et al., 2012) before the SE inoculation.
(2008) detected A/Chicken/HS/K5/01(H9N2) virus antigen in the lungs trachea spleen kidneys bursa thymus and cecal tonsils of experimentally infected 3-week-old broiler chickens on day 5 post-inoculation.
Compared to the mock-infected group, goose IFITM1 in the cecum, cecal tonsil, Harderian gland, and spleen was significantly upregulated in the TMUV-infected group.
birds, Other cause n = 167 of death Anatidae Baikal teal (Anas 122 None formosa) 1 None 5 None 20 Monocrotophos poisoning Bean goose (Anser 9 Monocrotophos fabalis) poisoning (3) 1 None 1 None Mallard (Anas 1 Peritonitis platyrhychos) 1 Gunshot, parasite infection White-fronted goose 1 None (Anser albifrons) Whooper swan (Cygnus 1 Renal failure cygnus) Other (not Anatidae) Coot (Fulica atra) 1 Postmortem change Little grebe 2 Postmortem change (Podicdeps ruficollis) Great egret (Egretta 1 Peritonitis alba alba) * C, cecal tonsil; H, heart; I, intestine, K, kidney; L, liver; Lu, lung; N, no; T, trachea P, pancreas; UK, unknown (pooled trachea, cecal tonsil, and kidney); Y, yes.
It was replicated systemically in the trachea, muscle, proventriculus, intestine (pancreas), cecal tonsil, lung, kidney, and heart, and was present at low titers ([10.sup.1.8-2.6] [TCID.sub.50]/0.1 mL).
The cecal tonsils (CT) are considered the largest lymphoid aggregates of avian gut-associated lymphoid tissue (GALT).
Then sampling was done from upper respiratory tract (trachea, lungs) and cecal tonsils. Finally, cytopathology slides were provided.