meniscus

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint
noun (optics) a lens that is concave on one side and convex on the other
noun (physics) the curved upper surface of a nonturbulent liquid in a vertical tube

From Ancient Greek μηνίσκος (mēnískos, “crescent”), from μήνη (mḗnē, “moon”). Piecewise doublet of moonish.

For this purpose he requested Alexander to send men to him with Meniscus and Arsimas, the messengers who came from the Persians, to receive pledges of fidelity from him and to give them on behalf of Alexander. — The Anabasis of Alexander : $b or, The history of the wars and conquests of Alexander the Great, Arrian

semilunar cartilage

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