pulverulent

Made of, covered with, or crumbling to fine powder or dust.

Dusty; crumbly.

Dusty; consisting of fine powder; powdery.

In zoology, finely powdery or dusty, as a surface; especially, covered as if powdered with very minute scales, as an insect.

In botany: Covered as if with powder or dust; pulveraceous: said of surfaces.