Below you can find some definitions of rheology.

The Columbia Encyclopedia, Sixth Edition | 2008 | Columbia University Press.

Branch of physics dealing with the deformation and flow of matter. It is particularly concerned with the properties of matter that determine its behavior when a mechanical force is exerted on it. Rheology is distinguished from fluid dynamics in that it is concerned with all three of the traditional states of matter rather than only with liquids and gases. Unlike polymer physics it is concerned with macroscopic properties and behavior and not with molecular structure. The results of rheology provide a mathematical description of the viscoelastic behavior of matter. Applications of rheology are important in many areas of industry, involving metals, plastics, and many other materials.

The Oxford Pocket Dictionary of Current English | 2009 | published by Oxford University Press

The branch of physics that deals with the deformation and flow of matter, esp. the non-Newtonian flow of liquids and the plastic flow of solids.

A Dictionary of Food and Nutrition | 2005 | DAVID A. BENDER | published by Oxford University Press 2005

Study of deformation and flow of materials; in food technology it involves plasticity of fats, doughs, milk curd, etc. It provides a scientific basis for subjective measurements such as mouth feel, spreadability, pourability.

A Dictionary of Earth Sciences | 1999 | AILSA ALLABY and MICHAEL ALLABY | published by Oxford University Press

Study of deformation and flow in materials, including their elasticity, viscosity, and plasticity. In geology, the study of flow in water, ice, magma, and during rock deformation.

A Dictionary of Ecology | MICHAEL ALLABY | 2004 | published by Oxford University Press

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The study of deformation and flow in materials (e.g. ice and water), including their elasticity, viscosity, and plasticity.

Source: Encyclopedia.com