Labra: The plural of labrum, a ring of fibrocartilage (fibrous cartilage) around the edge of the articular (joint) surface of a bone. In Latin, "labrum" means "lip." The term is generally used to designate a lip, edge, or brim. From Healthy Resources 10 Rheumatoid Arthritis Symptoms How IL Inhibitors Work to Treat PsoriasisModerate to Severe UC: Targeted Solutions Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew