from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A crescent-shaped body.
- n. A concavo-convex lens.
- n. 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.
- n. A cartilage disk that acts as a cushion between the ends of bones that meet in a joint.
from the GNU version of the Collaborative International Dictionary of English
- n. A crescent.
- n. A lens convex on one side and concave on the other.
- n. An interarticular synovial cartilage or membrane; esp., one of the intervertebral synovial disks in some parts of the vertebral column of birds.
from The Century Dictionary and Cyclopedia
- n. A crescent or crescentshaped body. Specifically
- n. A lens, convex on one side and concave on the other, and thicker in the center, so that its section presents the appearance of the moon in its first quarter.
- n. The convex or concave surface of a liquid, caused by capillarity: thus, the mercury in a barometer has a convex meniscus, but spirit or water a concave meniscus.
- n. In anatomy, an interarticular fibrocartilage, of a rounded, oval, disklike, or falcate shape, situated between the ends of bones, in the interior of joints, attached by the margins.
- n. In zoology, a peculiar organ, of doubtful function, found in Echinorhynchus, a genus of acanthocephalous parasitic worms.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint
- n. (optics) a lens that is concave on one side and convex on the other
- n. (physics) the curved upper surface of a nonturbulent liquid in a vertical tube
New Latin, from Greek mēniskos, diminutive of mēnē, moon, month.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek μηνίσκος (mēniskos, "crescent"), from μήνη (mēnē, "moon") (Wiktionary)