| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| cuscus | (noun) woolly-haired monkey-like arboreal marsupial of New Guinea and northern Australia | - |
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| discus | (noun) a disk used in throwing competitions | Synonyms: saucer |
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| (noun) an athletic competition in which a disk-shaped object is thrown as far as possible | - |
| hibiscus | (noun) any plant of the genus Hibiscus | - |
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| lemniscus | (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: fillet |
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| meniscus | (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 | - |
| (noun) (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | Synonyms: semilunar cartilage |
| viscus | (noun) a main organ that is situated inside the body | Synonyms: internal organ |
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