From The Collaborative International Dictionary of English v.0.48:

Viscosity \Vis*cos"i*ty\, n. [Cf. F. viscosit['e], LL.
   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]
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