rheo-
Current or flow.
[Greek rheos, stream.]
Rheology is the branch of physics that deals with the deformation and flow of matter, especially the non-Newtonian flow of liquids and the plastic flow of solids; a rheometer is an instrument for measuring the flow of fluids, especially blood; a rheostat is an electrical instrument used to control a current by varying the resistance; rheotaxis is the property of a living organism of responding to the stimulus of a flow of water.
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