me·nis·cus (m -n s ks)n. pl. me·nis·ci (-n s , -k, -k ) or me·nis·cus·es 1. A crescent-shaped body. 2. A concavo-convex lens. 3. The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls and convex if it does not. 4. A cartilage disk that acts as a cushion between the ends of bones that meet in a joint. [New Latin, from Greek m niskos, diminutive of mn, moon, month; see m-2 in Indo-European roots.]me·nis cal (-kl), me·niscate (-k t), me·niscoid (-koid), menis·coidal (m ns-koidl) adj. |   anterior view of a knee joint |
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