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meniscus (n.)

"a crescent or crescent-shaped body," 1690s in reference to lenses convex on one side, concave on the other, and thicker in the middle; c. 1812 in reference to liquid surfaces, Modern Latin meniscus, from Greek meniskos "lunar crescent," diminutive of mene "moon" (see moon (n.)). Related: Meniscoid; mensicoidal; mensical; mensicate.

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Definitions of meniscus from WordNet

meniscus (n.)
(anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint;
Synonyms: semilunar cartilage
meniscus (n.)
(optics) a lens that is concave on one side and convex on the other;
meniscus (n.)
(physics) the curved upper surface of a nonturbulent liquid in a vertical tube;
From wordnet.princeton.edu