Jisho

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Noun
1. back (of body)
Wikipedia definition
2. Human backThe human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest, its height being defined by the vertebral column (commonly referred to as the spine or backbone) and its breadth being supported by the ribcage and shoulders. The spinal canal runs through the spine and provides nerves to the rest of the body.
Read “Human back” on English Wikipedia
Read “背中” on Japanese Wikipedia
Read “Human back” on DBpedia
Other forms
背なか 【せなか】

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