Akademik

diffusivity
\\də̇ˌfyüˌsivəd.ē, -ˈzi- sometimes (ˌ)dēˌ-\ noun (-es)
1. : diffusion coefficient
2. : the quantity of heat passing normally through a unit area per unit time divided by the product of specific heat, density, and temperature gradient

Useful english dictionary. 2012.