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 ?
Although most professional discussions do not provide a specific definition of "lethal anomaly," the term is generally used to refer to a child with (1) severe neurological compromise and (2) structural anomalies and/or functional disabilities that, if untreated, would cause death within a few months.
This request may be based on the results of investigations that imply that the baby will almost certainly have a lethal anomaly, eg.
If a congenital anomaly was detected and found lethal, then couples were counselled for termination and explained the risk of lifelong morbidity if lethal anomaly present.