chi·gnon /ˈʃinˌjɑn ||ˌjɔn/
假髻
Chi·gnon n. A knot, boss, or mass of hair, natural or artificial, worn by a woman at the back of the head.
A curl that had strayed from her chignon. --H. James.
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chignon
n : a roll of hair worn at the nape of the neck