单词	frenum
释义	frenum /ˈfriːnəm / (also fraenum) noun Another term for frenulum.The abnormal fraenum is attached so low on the gum-line that it props apart the two front teeth.... To avoid cutting through the fraenum, it is positioned slightly to one side underneath the tongue. When any of these frenums are much shorter than normal, they can limit the movement of the tissues they attach to. Origin Mid 18th century: from Latin, literally 'bridle'.
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