Noun | 1. | coarctation - tight or narrow compression compression, contraction, condensation - the process or result of becoming smaller or pressed together; "the contraction of a gas on cooling" |
2. | coarctation - (biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta narrowing - an instance of becoming narrow biological science, biology - the science that studies living organisms |