floating rib

noun
🔊/ˌfləʊtɪŋ ˈrɪb/
🔊/ˌfləʊtɪŋ ˈrɪb/
(also false rib)
(anatomy解剖学)
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  1. any of the lower ribs that are not attached to the breastbone浮肋;浮动弓肋