Anomaly

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Anomaly

An unusual or unrepeatable event. For example, a stock index inexplicably rising 20% in a week during a bear market may constitute an anomaly.
References in periodicals archive ?
magister, followed by periods of acardia [ILLUSTRATION FOR FIGURES 1A AND C, 4F, AND 5F OMITTED].
Usually one twin has acardia (recipient) and the other is structurally normal (donor twin).