dominant /dom′inənt/ [L, dominari, to rule] , 1. exerting a ruling or controlling influence. 2. in genetics, capable of expression when carried by only one of a pair of homologous chromosomes. 3. in coronary artery anatomy, supplying the posterior diaphragmatic part of the interventricular septum and the diaphragmatic surface of the left ventricle; said of the right and left coronary arteries.
