hypsarrhythmia

noun
hyps·ar·rhyth·mia
variants: or hypsarhythmia \ˌhips-ā-ˈrit͟h-mē-ə \

Medical Definition of hypsarrhythmia 

: an abnormal encephalogram that is characterized by slow waves of high voltage and a disorganized arrangement of spikes, occurs especially in infants, and is indicative of a condition that leads to severe mental retardation if left untreated

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