Main Entry: vis·cos·i·ty

Pronunciation: \vis-ˈkä-sə-tē\

Function: noun

Inflected Form(s): plural vis·cos·i·ties

Etymology: Middle English viscosite, from Anglo-French viscosité, from Medieval Latin viscositat-, viscositas, from Late Latin viscosus viscous

Date: 14th century

1 : the quality or state of being viscous
2 : the property of resistance to flow in a fluid or semifluid
3 : the ratio of the tangential frictional force per unit area to the velocity gradient perpendicular to the direction of flow of a liquid —called also coefficient of viscosity