| chaperon | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperone |
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| chaperone | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperon |
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| emperor | (noun) large richly colored butterfly | Synonyms: emperor butterfly |
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| (noun) large moth of temperate forests of Eurasia having heavily scaled transparent wings | Synonyms: emperor moth, Saturnia pavonia |
| (noun) red table grape of California | - |
| (noun) the male ruler of an empire | - |
| hyperon | (noun) any baryon that is not a nucleon; unstable particle with mass greater than a neutron | - |
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| hyperope | (noun) a person with hyperopia; a farsighted person | - |
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| hyperopia | (noun) abnormal condition in which vision for distant objects is better than for near objects | Synonyms: farsightedness, hypermetropia, hypermetropy, longsightedness |
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| obstreperousness | (noun) noisy defiance | - |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| operoseness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, toilsomeness |
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| peperomia | (noun) any of various plants of the genus Peperomia; grown primarily for their often succulent foliage | - |
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| pepperoni | (noun) a pork and beef sausage (or a thin slice of this sausage) | - |
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| peroneus | (noun) muscle of the lower leg that is involved in moving the foot | - |
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| peroration | (noun) (rhetoric) the concluding section of an oration | - |
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| (noun) a flowery and highly rhetorical oration | - |
| peroxidase | (noun) any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide | - |
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| peroxide | (noun) a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels | Synonyms: hydrogen peroxide |
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| (noun) an inorganic compound containing the divalent ion -O-O- | - |
| piperocaine | (noun) a compound used in the form of its hydrochloride as a local or spinal anesthetic | Synonyms: Metycaine, piperocaine hydrochloride |
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| superorder | (noun) (biology) a taxonomic group ranking above an order and below a class or subclass | - |
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| superordinate | (noun) a word that is more generic than a given word | Synonyms: hypernym, superordinate word |
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| (noun) one of greater rank or station or quality | Synonyms: higher-up, superior |
| superordination | (noun) the semantic relation of being superordinate or belonging to a higher rank or class | Synonyms: hypernymy |
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| superoxide | (noun) the univalent anion O2- | Synonyms: superoxide anion |
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| (noun) a metallic oxide containing the univalent anion O2- | - |