hypsarrhythmia
noun
hyps·ar·rhyth·mia
variants:
or hypsarhythmia \ ˌhips-ā-ˈrit͟h-mē-ə 
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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 intellectual disability if left untreated
Other Words from hypsarrhythmia
hypsarrhythmic
or hypsarhythmic \ -mik
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adjective
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adjective