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Without symptoms, or producing no symptoms.
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asymp·tom·at·ic .ā-.sim(p)-tə-'mat-ik adj presenting no symptoms of disease <\asymptomatic amebiasis>
asymp·tom·at·i·cal·ly -i-k(ə-)lē adv
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adj.
not showing any symptoms of disease, whether disease is present or not.
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asymp·to·mat·ic (a″simp-to-matґik) showing or causing no symptoms.Medical dictionary. 2011.