'Viscosity' definitions:

Definition of 'viscosity'

From: WordNet
noun
Resistance of a liquid to shear forces (and hence to flow) [syn: viscosity, viscousness]

Definition of 'Viscosity'

From: GCIDE
  • 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]