/ Dictionary / Index A aorta: Meaning and Definition of Find definitions for: a•or•ta Pronunciation: (ā-ôr'tu), [key] — pl. -tas, -tae the main trunk of the arterial system, conveying blood from the left ventricle of the heart to all of the body except the lungs. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aorta (Thesaurus) aoristic aortic arch Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language