| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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| cryptomonad | (noun) common in fresh and salt water appearing along the shore as algal blooms | Synonyms: cryptophyte |
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| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| kleptomania | (noun) an irresistible impulse to steal in the absence of any economic motive | - |
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| kleptomaniac | (noun) someone with an irrational urge to steal in the absence of an economic motive | - |
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| leptomeninges | (noun) the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers | - |
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| leptomeningitis | (noun) inflammation of the leptomeninges | - |
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| optometrist | (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: oculist |
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| optometry | (noun) the practice of an optometrist | - |
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| presymptomatic | (adjective) of or relating to the early phases of a disease when accurate diagnosis is not possible because symptoms of the disease have not yet appeared | Synonyms: preclinical |
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| ptomain | (noun) any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria | Synonyms: ptomaine |
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| ptomaine | (noun) a term for food poisoning that is no longer in scientific use; food poisoning was once thought to be caused by ingesting ptomaines | Synonyms: ptomaine poisoning |
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| (noun) any of various amines (such as putrescine or cadaverine) formed by the action of putrefactive bacteria | Synonyms: ptomain |
| 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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| symptom | (noun) anything that accompanies X and is regarded as an indication of X's existence | - |
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| (noun) (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease | - |
| symptomatic | (adjective) relating to or according to or affecting a symptom or symptoms | - |
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| (adjective) characteristic or indicative of a disease | Synonyms: diagnostic |
| symptomatically | (adverb) by symptoms | - |
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| symptomless | (adjective) having no symptoms of illness or disease | Synonyms: asymptomatic |
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