1. sphenoid bone (of the skull)
Wikipedia definition
2. Sphenoid boneThe sphenoid bone (from Greek sphenoeides, "wedgelike") is an unpaired bone situated at the base of the skull in front of the temporal bone and basilar part of the occipital bone. The sphenoid bone is one of the seven bones that articulate to form the orbit. Its shape somewhat resembles that of a butterfly or bat with its wings extended.
Read “Sphenoid bone” on English Wikipedia
Read “蝶形骨” on Japanese Wikipedia
Read “Sphenoid bone” on DBpedia
Other forms
ちょう形骨 【ちょうけいこつ】


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