1. designating, of, or near either of the two principal arteries, one on each side of the neck,
which convey the blood from the aorta to the head
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'carotid'Gr karōtis, pl. karōtides, the two great arteries of the neck < karoun, to plunge into sleep or stupor: so called because compression of these was believed
to cause unconsciousness