| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| reptile | (noun) any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms | Synonyms: reptilian |
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| reptilian | (noun) any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms | Synonyms: reptile |
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| streptobacillus | (noun) any of various rod-shaped Gram-negative bacteria | - |
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| streptocarpus | (noun) any of various plants of the genus Streptocarpus having leaves in a basal rosette and flowers like primroses | - |
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| streptococci | (noun) spherical Gram-positive bacteria occurring in pairs or chains; cause e.g. scarlet fever and tonsillitis | Synonyms: strep, streptococcus |
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| streptococcus | (noun) spherical Gram-positive bacteria occurring in pairs or chains; cause e.g. scarlet fever and tonsillitis | Synonyms: strep, streptococci |
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| streptodornase | (noun) an enzyme produced by some hemolytic strains of streptococcus that dissolves fibrinous secretions from infections; used medicinally (often in combination with streptokinase) | - |
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| streptokinase | (noun) an enzyme produced by some strains of streptococcus that can liquefy blood clots by converting plasminogen to plasmin; used medicinally in some cases of myocardial infarction and pulmonary embolism | - |
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| streptolysin | (noun) any of several hemolysins derived from strains of streptococcus | - |
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| streptomyces | (noun) aerobic bacteria (some of which produce the antibiotic streptomycin) | - |
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| streptomycin | (noun) an antibiotic produced by the actinomycete Streptomyces griseus and used to treat tuberculosis | - |
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| streptothricin | (noun) a basic antibiotic derived from a soil actinomycete | - |
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