NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,780 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

tonsil
(TON-sil)
One of two small masses of lymphoid tissue on either side of the throat.

EnlargeAnatomy of the oral cavity; drawing shows the lip, hard palate, soft palate, retromolar trigone, front two-thirds of the tongue, gingiva, buccal mucosa, and floor of mouth. Also shown are the teeth, uvula, and tonsil.

Anatomy of the oral cavity. The oral cavity includes the lips, hard palate (the bony front portion of the roof of the mouth), soft palate (the muscular back portion of the roof of the mouth), retromolar trigone (the area behind the wisdom teeth), front two-thirds of the tongue, gingiva (gums), buccal mucosa (the inner lining of the lips and cheeks), and floor of the mouth under the tongue.