ankyloglossia

noun
an·​ky·​lo·​glos·​sia | \ˌaŋ-kə-(ˌ)lō-ˈglä-sē-ə, -ˈglȯ- \

Medical Definition of ankyloglossia 

: limited normal movement of the tongue chiefly due to an abnormally shortened frenulum : tongue-tie Technically known as ankyloglossia, it is a usually minor birth defect in which a flap of tissue under the tongue, called the frenum or frenulum, is too short or absent.— C. Claiborne Ray, The New York Times, 26 Oct. 2004

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