ziggurat
l='sense 1c'> : to spread thinly or wastefully //a government in which power is diffused
physics : to subject to diffusion (see diffusion sense 3)
especially : to break up and distribute (incident light) by reflection //put up a screen to diffuse the light
: to spread out or become transmitted especially by contact //The civilization diffused westward.
: to undergo diffusion //heat from the radiator diffusing throughout the room