ISCHION
\ˈɪsʃən], \ˈɪsʃən], \ˈɪ_s_ʃ_ə_n]\
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The lowermost of the three portions which compose the os innominatum in the foetus and young individual. The inferior region of the same bone has, also, been called ischium, in the adult. According to Hesychius, the ancients designated by the word ischion the capsular ligament of the coxo-femoral articulation, as well as the articulation itself.
By Robley Dunglison