abnormal narrowing of the aorta, especially of its orifice, usually as a result of rheumatic fever or embryologic anomalies.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Pathological narrowing of the orifice of the aortic valve.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.