Dictionary

viscosity index

noun

Definition of VISCOSITY INDEX

:  an arbitrary number assigned as a measure of the constancy of the viscosity of a lubricating oil with change of temperature with higher numbers indicating viscosities that change little with temperature

First Known Use of VISCOSITY INDEX

1929

Browse

Next Word in the Dictionary: viscountPrevious Word in the Dictionary: viscosity breakingAll Words Near: viscosity index
April 26, 2015
rococo Hear it
excessively ornate or intricate
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears