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idiopathic

id·io·path·ic

adj \ˌid-ē-ə-ˈpath-ik\

: arising spontaneously or from an obscure or unknown cause : primary <idiopathic epilepsy> <idiopathic thrombocytopenic purpura>

—id·io·path·i·cal·ly \-ˈpath-i-k(ə-)lē\ adverb

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