Meniscus

(men-is' -kits). A concavo-convex lens. A concavo-convex articular cartilage, or the semilunar cartilage of the knee-joint. Also, the concavity or convexity produced on the surface of liquids in tubes and ve els by capillary attraction. M., Tactile, a form of nerve-ending with a concave surface turned ectad, each concavity containing a tactile cell.