hereditary

mastery
UK /həˈɹɛdɪt(ə)ɹi/ US /həˈɹɛdɪˌtɛɹi/adjnoun

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Which word is closest in meaning to 'hereditary' in this sentence?

Her face is really swollen, but she says that it isn't the mumps. Apparently, it's some unknown hereditary disease.