or  hyps*arhyth*mia  n :  an abnormal encephalogram that is characterized by slow waves of high voltage and a disorganized arrangement of spikes, occurs esp. in infants, and is indicative of a condition that leads to severe mental retardation if left untreated hyps*ar*rhyth*mic or  hyps*arhyth*mic  adj 
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.