/vi skos"i tee/ , n. , pl. viscosities .
1. the state or quality of being viscous.
2. Physics.
a. the property of a fluid that resists the force tending to cause the fluid to flow.
b. the measure of the extent to which a fluid possesses this property.
[ 1375-1425; late ME viscositas, equiv. to L viscos ( us ) VISCOUS + -itas- -ITY ]