4つある扁桃（リンパ性器官）の一つで、舌根部の粘膜が丘のように高まった部分のこと。「日本人体解剖学 (下巻) 」には詳しい解説は見られない。また、ネットで検索しても詳しく解説しているサイトはほとんどない。
・「Wikipedia」
「The lingual tonsils are rounded masses of lymphatic tissue that cover the posterior region of the tongue.They are located on the dorsal surface at the base of the tongue. Their lymphatic tissue are dense and nodular, their surface is covered with stratified squamous epithelium which invaginates as a single crypt into each lingual tonsil. They are partially surrounded by connective tissue placing them in the group of Partially Encapsulated Lymphatic Organs, tonsils, the only one of its kind. They have associated mucous glands which are drained by ducts directly into the single tonsillar crypt.」
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