trabeculectomy

noun

tra·​bec·​u·​lec·​to·​my trə-ˌbek-yə-ˈlek-tə-mē 

plural trabeculectomies

: surgical excision of a small portion of the trabecular tissue lying between the anterior chamber of the eye and the canal of Schlemm in order to facilitate drainage of aqueous humor for the relief of glaucoma