definition of carotid
Wiktionary (0.00 / 0 votes) Rate this definition: carotid (Noun). A number of major arteries in the head and neck. carotid (Adjective). Relating to these arteries. Origin: From caros or ÎºÎ¬ÏÎ¿Ï. From the fact that the carotid artery supplies blood to the brain, and interruption of this flow causes loss of consciousness.