| amazon | (noun) mainly green tropical American parrots | - |
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| (noun) a large strong and aggressive woman | Synonyms: virago |
| blazon | (noun) the official symbols of a family, state, etc. | Synonyms: arms, blazonry, coat of arms |
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| blazonry | (noun) the official symbols of a family, state, etc. | Synonyms: arms, blazon, coat of arms |
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| cefoperazone | (noun) a parenteral cephalosporin (trade name Cefobid) used for severe infections | Synonyms: Cefobid |
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| diazonium | (noun) the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes | - |
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| horizon | (noun) the range of interest or activity that can be anticipated | Synonyms: purview, view |
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| (noun) the line at which the sky and Earth appear to meet | Synonyms: apparent horizon, sensible horizon, skyline, visible horizon |
| (noun) a specific layer or stratum of soil or subsoil in a vertical cross section of land | - |
| (noun) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth | Synonyms: celestial horizon |
| horizontal | (noun) something that is oriented horizontally | - |
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| horizontality | (noun) the quality of being parallel to the horizon | - |
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| oxyphenbutazone | (noun) an anti-inflammatory drug (trade name Tandearil) used to treat arthritis and bursitis | Synonyms: Tandearil |
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| ozone | (noun) a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation) | - |
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| ozonide | (noun) any of a class of unstable chemical compounds resulting from the addition of ozone to a double bond in an unsaturated compound | - |
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| ozonosphere | (noun) a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun | Synonyms: ozone layer |
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| phenylbutazone | (noun) anti-inflammatory drug (trade name Butazolidin) | Synonyms: Butazolidin |
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| scorzonera | (noun) long black salsify | Synonyms: black salsify |
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| (noun) perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots | Synonyms: black salsify, Scorzonera hispanica, viper's grass |
| zona | (noun) (anatomy) any encircling or beltlike structure | Synonyms: zone |
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| zone | (noun) (anatomy) any encircling or beltlike structure | Synonyms: zona |
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| (noun) a locally circumscribed place characterized by some distinctive features | - |
| (noun) an area or region distinguished from adjacent parts by a distinctive feature or characteristic | - |
| (noun) any of the regions of the surface of the Earth loosely divided according to latitude or longitude | Synonyms: geographical zone |
| zoning | (noun) dividing an area into zones or sections reserved for different purposes such as residence and business and manufacturing etc | - |
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| zonula | (noun) small beltlike zone | Synonyms: zonule |
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| zonule | (noun) small beltlike zone | Synonyms: zonula |
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