Dilatant

A dilatant (also termed shear thickening) material is one in which viscosity increases with the rate of shear strain. Such a shear thickening fluid, also known by the acronym STF, is an example of a non-Newtonian fluid. A dilatant is a Non-Newtonian fluid where the shear viscosity increases with applied shear stress. This behavior is only one type...
Found on http://en.wikipedia.org/wiki/Dilatant

Dilatant

A liquid that thickens (increases its viscosity) with agitation.
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