1) Abnormal 
Performing a nerve conduction study in such a manner that the nerve impulse is being propagated in a direction opposite to that in which the nerve fibre ordinarily conducts. ... (05 Mar 2000) ... 
(an″te-drom´ik) conducting impulses in a direction opposite to the normal.
Running in the opposite direction along an axis. Thus an antidromic signal in a neuron would travel from the presynaptic region back towards the cell body, the opposite of normal.
Running in the opposite direction: most common usage is in neurophysiology for the passage of an action potential in the opposite direction to that in which it would normally travel ie. from presynaptic region towards cell body.
Type: Term Pronunciation: an′tē-drom′ik Definitions: 1. Denoting the propagation of an impulse along a conduction system (nerve fiber) in the direction opposite to that which it normally travels.
[adj] - (physiology) conducting nerve impulses in a direction opposite to normal
adjective conducting nerve impulses in a direction opposite to normal
adjective, Greek a = negative, and dromos = current, hence conducting in the opposite direction to the usual.
conducting nerve impulses in a direction opposite to the usual one.