coefficient of viscosity

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

• noun The degree to which a fluid resists flow under an applied force, measured by the tangential friction force per unit area divided by the velocity gradient under conditions of streamline flow.

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

• noun a measure of the resistance to flow of a fluid under an applied force