| hepadnavirus | (noun) a group of animal DNA viruses including viruses of ducks and woodchucks and squirrels and others as well as the virus causing hepatitis B in humans | - |
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| heparin | (noun) a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery | Synonyms: Lipo-Hepin, Liquaemin |
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| hepatic | (noun) any of numerous small green nonvascular plants of the class Hepaticopsida growing in wet places and resembling green seaweeds or leafy mosses | Synonyms: liverwort |
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| hepatica | (noun) any of several plants of the genus Hepatica having three-lobed leaves and white or pinkish flowers in early spring; of moist and mossy subalpine woodland areas of north temperate regions | Synonyms: liverleaf |
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| (noun) a common liverwort | Synonyms: Marchantia polymorpha |
| hepatitis | (noun) inflammation of the liver caused by a virus or a toxin | - |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| hepatoma | (noun) carcinoma of the liver | Synonyms: hepatocarcinoma, hepatocellular carcinoma, malignant hepatoma |
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| hepatomegaly | (noun) abnormal enlargement of the liver | Synonyms: megalohepatia |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
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| heptagon | (noun) a seven-sided polygon | - |
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| heptane | (noun) a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings | - |
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| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
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| heptose | (noun) a monosaccharide with seven carbon atoms. | - |
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