frenulum
noun [ C ] anatomy specialized uk/ˈfriːn.jə.ləm/ us/ˈfren.jə.ləm/ frenula /ˈfriːn.jʊ.lə/ /ˈfren.jə.lə/
（拉丁语，用于医学术语中）系带，小束带
a small skin fold or fold of mucous membrane that limits the movement of a body part
A short lingual frenulum may contribute to feeding, speech, and mechanical tongue problems. 舌系带短小可能造成吞咽、语言和舌头机械运动方面的障碍。