Describing impulses traveling the wrong way in a nerve fiber. This is rare but may happen in shingles, when the irritation caused by the virus in the spinal canal initiates impulses that travel outward in normally afferent nerves. The area of skin that the sensory nerves supply (usually a strip on the trunk) becomes painfully blistered. Antidromic impulses cannot pass synapses, which work in one direction only.
Denoting nerve impulses traveling in the opposite direction from normal.