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viscosity index

American  

noun

Automotive, Machinery.

  1. an arbitrary scale for lubricating oils that indicates the extent of variation in viscosity with variation of temperature.

Etymology

Origin of viscosity index

First recorded in 1935–40

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.