Breadcrumb Home > Dictionary > Index V viscosity index: Meaning and Definition of Find definitions for: viscos'ity in"dex Pronunciation: [key] — Auto., Mach. Auto.,Mach. an arbitrary scale for lubricating oils that indicates the extent of variation in viscosity with variation of temperature. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. viscosity viscount TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: rosarium Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language