ann'ulus

[L.] ring; a circular or ring-shaped structure, a. abdomina'lis, the internal or external opening of the inguinal canal, a. inguinal is abdominal is or a. inguinal is subcutaneus. a. cilia'ris, the periphery of the iris. a. crura'lis, a. femoral is. a. conjunct i'vao [BNA], conjunctival ring, a narrow ring at the junction of the periphery of the cornea with the conjunctiva. a. femora'lis [BNA], crural or femoral ring; the upper opening of the femoral canal, bounded in front by Poupart's ligament, behind by the pectineus muscle, internally by Gimbernat's ligament, and externally by the femoral vein. a, fibro cart i lag in'eus membra'nse tym'pan i [BNA], fibro cartilaginous ring of the drum membrane, the thickened portion of the cir-