ˌ ̷ ̷ˌ ̷ ̷ˈthrōsə̇s noun
( plural enarthro·ses -ōˌsēz)
Etymology: New Latin, from Greek enarthrōsis, from en- en- (II) + arthrōsis arthrosis
: an articulation in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction : a ball-and-socket joint (as the hip joint)