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From The Collaborative International Dictionary of English v.0.48:
Viscosity \Vis*cos"i*ty\, n. [Cf. F. viscosit['e], LL. viscositas.] 1. The quality or state of being viscous. [1913 Webster] 2. (Physics) A property possessed by a viscous fluid, being a resistance to the forces causing a fluid to flow, caused by interactions between the molecules of the fluid and between the fluid and the walls of the conduit through which it moves; also, a measure of such a property. [1913 Webster +PJC]