"stopping of fibrillation," by 1936; by 1940 specifically in reference to heartbeat, from de- + fibrillation "a beating in an abnormal way," especially of the muscles of the heart that contract irregularly in this condition.
deferment
deferral
deferred
defiance
defiant
defibrillation
defibrillator
deficiency
deficient
deficit
defilade
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