Englishfor English speakers
achromatic
Adjective
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If something is achromatic, it does not have color.
meniscus
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noun
(physics) the curved upper surface of a nonturbulent liquid in a vertical tube
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noun
(optics) a lens that is concave on one side and convex on the other
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noun
(anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint