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viscosity index

noun, Automotive, Machinery
an arbitrary scale for lubricating oils that indicates the extent of variation in viscosity with variation of temperature.
Origin of viscosity index
1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for viscosity index
  • Polyisobutylene, a chemical derivative, is used in lubricating oils where it acts as viscosity index improvers.

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