blood pressure

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The pressure exerted by the blood against the walls of the blood vessels, especially the arteries. It varies with the strength of the heartbeat, the elasticity of the arterial walls, the volume and viscosity of the blood, and a person's health, age, and physical condition.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The pressure exerted by the blood against the walls of the arteries and veins; it varies during the heartbeat cycle, and according to a person's age, health and physical condition.
• noun The measurement of a person's blood pressure, expressed as systolic blood pressure and diastolic blood pressure readings.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the pressure of the circulating blood against the walls of the blood vessels; results from the systole of the left ventricle of the heart; sometimes measured for a quick evaluation of a person's health