Jisho

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きょうこつ 胸骨
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Noun, Noun which may take the genitive case particle 'no'
1. breastbone; sternum​
Wikipedia definition
2. Sternum​This article is about the vertebrate sternum in general. For other uses, see Human sternum and Sternum (arthropod anatomy). The sternum or breastbone, in vertebrate anatomy, is a flat bone. It probably first evolved in early tetrapods as an extension of the pectoral girdle; it is not found in fish. In amphibians and reptiles it is typically a shield-shaped structure, often composed entirely of cartilage. It is absent in both turtles and snakes.
Read “Sternum” on English Wikipedia
Read “胸骨” on Japanese Wikipedia
Read “Sternum” on DBpedia

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