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Related to cotyloid cavity: cotyloid bone
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|Noun||1.||cotyloid cavity - the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint|
hipbone, innominate bone - large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis
socket - a bony hollow into which a structure fits