Wordnet 3.0
NOUN (1)
1. 
 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; 
- Example: "adult blood pressure is considered normal at 120/80 where the first number is the systolic pressure and the second is the diastolic pressure"
WordNet (r) 3.0 (2006):
blood pressure
    n 1: 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; "adult blood pressure is
         considered normal at 120/80 where the first number is the
         systolic pressure and the second is the diastolic pressure"