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A movable joint such as is used in folding rulers or table flaps.
Mid 18th century; earliest use found in Benjamin Gooch (?1708–1776), surgeon. From rule + joint.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。