Relating to or affecting both ischial bones (the lower hip bones) on either side of the body.
From Latin 'bis' (twice) + 'ischium' (hip bone) + Greek '-adic' (relating to). The term combines the prefix meaning 'double' with anatomical terminology that evolved in medical Latin during the Renaissance.
This ultra-specific anatomical term shows how medical professionals had to invent precise language to describe symmetrical body parts affected on both sides—it's the difference between saying 'my hips hurt' and pinpointing exactly which bones are involved.
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