acromion

noun
acro·​mi·​on | \ə-ˈkrō-mē-ˌän, -ən \

Medical Definition of acromion 

: the outer end of the spine of the scapula that protects the glenoid cavity, forms the outer angle of the shoulder, and articulates with the clavicle

called also acromial process, acromion process

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