communicating artery
nounMedical Definition of communicating artery
: any of three arteries in the brain that form parts of the circle of Willis:
a
: one connecting the anterior cerebral arteries
— called also anterior communicating artery
b
: either of two arteries that occur one on each side of the circle of Willis and connect an internal carotid artery with a posterior cerebral artery
— called also posterior communicating artery