A measure of the rheid behaviour of a substance, equal to the time required for the viscous deformation to become one thousand times greater than the elastic deformation under some particular conditions.
Origin
1950s. From rheid + -ity.
Definition of rheidity in US English:
rheidity
nounriːˈɪdɪti
Geology
A measure of the rheid behaviour of a substance, equal to the time required for the viscous deformation to become one thousand times greater than the elastic deformation under some particular conditions.