/ Dictionary / Index V viscosity: Meaning and Definition of Find definitions for: vis•cos•i•ty Pronunciation: (vi-skos'i-tē), [key] — pl. -ties. the state or quality of being viscous. the property of a fluid that resists the force tending to cause the fluid to flow. the measure of the extent to which a fluid possesses this property. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: viscosity (Thesaurus) viscose viscosity index Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language