| ache | (noun) a dull persistent (usually moderately intense) pain | Synonyms: aching |
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| achene | (noun) small dry indehiscent fruit with the seed distinct from the fruit wall | - |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achievement | (noun) the action of accomplishing something | Synonyms: accomplishment |
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| achiever | (noun) a person with a record of successes | Synonyms: succeeder, success, winner |
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| achillea | (noun) any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads | - |
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| achimenes | (noun) any plant of the genus Achimenes having showy bell-shaped flowers that resemble gloxinias | Synonyms: hot water plant |
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| aching | (noun) a dull persistent (usually moderately intense) pain | Synonyms: ache |
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| achira | (noun) canna grown especially for its edible rootstock from which arrowroot starch is obtained | Synonyms: arrowroot, Canna edulis, Canna indica, indian shot |
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| achlorhydria | (noun) an abnormal deficiency or absence of free hydrochloric acid in the gastric juice; often associated with severe anemias and cancer of the stomach | - |
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| acholia | (noun) a condition in which little or no bile is secreted or the flow of bile into the digestive tract is obstructed | Synonyms: cholestasis |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| achromatism | (noun) the visual property of being without chromatic color | Synonyms: achromaticity, colorlessness, colourlessness |
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| achromia | (noun) an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells | - |
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| achylia | (noun) absence of gastric juices (partial or complete) | Synonyms: achylia gastrica |
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