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
First recorded in 1935–40
Words nearby viscosity index
viscoid,
viscometer,
visconti,
viscose,
viscosity,
viscosity index,
viscount,
viscount melville sound,
viscountcy,
viscountess,
viscounty