| azadirachtin | (noun) insecticide | - |
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| azalea | (noun) any of numerous ornamental shrubs grown for their showy flowers of various colors | - |
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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| azedarach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azederach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| azederach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azedarach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| azide | (noun) a chemical compound containing the azido group combined with an element or radical | - |
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| azido | (adjective) relating to or containing the azido group N3 | - |
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| azimuth | (noun) the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian | Synonyms: AZ |
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| azimuthal | (adjective) of or relating to or in azimuth | - |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| azo | (adjective) relating to or containing the azo radical | - |
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| azoic | (adjective) before the appearance of life | - |
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| azoimide | (noun) a colorless explosive liquid that is volatile and poisonous and foul-smelling | Synonyms: HN, hydrazoic acid, hydrogen azide |
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| azonal | (adjective) not divided into zones | - |
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| azonic | (adjective) not restricted to any particular zone or region | - |
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| azotaemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotemia, uraemia, uremia |
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| azote | (noun) an obsolete name for nitrogen | - |
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| azotemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, uraemia, uremia |
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| azotemic | (adjective) of or involving excess nitrogenous waste products in the urine (usually due to kidney insufficiency) | Synonyms: uraemic, uremic |
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| azotic | (adjective) of or containing nitrogen | Synonyms: nitric, nitrous |
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| azoturia | (noun) excess of urea in the urine | - |
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| aztreonam | (noun) an antibiotic (trade name Azactam) used against severe infections; has minimal side effects | Synonyms: Azactam |
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| azure | (adjective) of a deep somewhat purplish blue color similar to that of a clear October sky | Synonyms: bright blue, cerulean, sky-blue |
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| (noun) a light shade of blue | Synonyms: cerulean, lazuline, sapphire, sky-blue |
| (verb) color azure | - |
| azurite | (noun) blue carbonate of copper; blue malachite | - |
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| azygos | (adjective) occurring singly; not one of a pair | Synonyms: azygous |
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| azygous | (adjective) occurring singly; not one of a pair | Synonyms: azygos |
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| azymia | (noun) absence of an enzyme | - |
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