antidromic
adjective
an·ti·drom·ic ˌan-ti-ˈdrä-mik 
: proceeding or conducting in a direction opposite to the usual one —used especially of a nerve impulse or fiber
antidromically
ˌan-ti-ˈdrä-mi-k(ə-)lē
adverb 
Word History
Etymology
anti- + Greek dromos racecourse, running — more at dromedary
First Known Use
1895, in the meaning defined above
Medical Definition
antidromic
adjective
an·ti·dro·mic ˌant-i-ˈdräm-ik -ˈdrōm-
-ˈdrōm- 1
: proceeding or conducting in a direction opposite to the usual one —used especially of a nerve impulse or fiber
antidromic action potentials
2
: characterized by antidromic conduction
antidromic tachycardia in which impulses travel from the ventricle to the atrium via the atrioventricular node