n, pl  -tries  :  a cardiac mechanism that is held to explain certain abnormal heart actions (as tachycardia) and that involves the transmission of a wave of depolarization along an alternate pathway when the original pathway is blocked with return of the impulse along the blocked pathway when the alternate pathway is refractory and then transmission along the open pathway resulting in an abnormality .
 
 
 
Similar sounding terms:  re·na·ture 
 
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