acromionectomy

acro·mi·on·ec·to·my ə-.krō-mē-.än-'ek-tə-mē, -mē-ə-'nek- n, pl -mies partial or total surgical excision of the acromion

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acro·mio·nec·to·my (ə-kro″me-o-nekґtə-me) resection of the distal end of the acromion, done in the treatment of acromioclavicular arthritis.