Definition of ischium in English:
 ischium
nounPlural ischia ˈɪskɪəmˈɪskiəm
The curved bone forming the base of each half of the pelvis.
 Example sentencesExamples
-  The pelvic component of the hip joint is called the acetabulum, which has contributions from the ischium, ilium and pubis.
 -  The proximal tibia is the most common site followed by the femur, fibula, and ischium.
 -  After further dissection, the surgeon exposes the pubic bone and identifies the ischium by palpation.
 -  I also noticed another protruding bone called the ischium and I became very excited because I knew that this was not a fish but a tetrapod.
 -  The inferior, posterior portion of the coxal bone is the ischium.
 -  In 1992, I developed a serious ulcer on my right ischium.
 
Derivatives
  
adjective ˈɪskɪəlˈɪskiəl
 Typically they overlie pressure areas, including elbows, fingers, and Achilles, ischial, and sacral prominences.
 Example sentencesExamples
-  The sacrotuberous ligament is a cartilaginous attachment of the sacrum to the ischial tuberosity.
 -  Defect or nonunion of the pubic and ischial rami is occasionally observed.
 -  Vertex rotates from transverse to either posterior or anterior position to pass the ischial spines.
 -  In adolescent patients with a history of proximal hamstring injury and current ischial tenderness, a radiograph of the pelvis should be performed.
 
Origin
  
Early 17th century: from Latin, from Greek iskhion 'hip joint', later 'ischium'.