pascal Syllabification: (pas·cal)Pronunciation: /päˈskäl/Definition of pascal noun the SI unit of pressure, equal to one newton per square meter (approximately 0.000145 pounds per square inch, or 9.9 × 106 atmospheres). Origin: 1950s: named after B. Pascal (see Pascal, Blaise)pascal in other Oxford dictionaries Definition of pascal in the British & World English dictionary