rustdust
nounUK /ˈrʌst.dʌst/
US /ˈrʌst.dʌst/
Tiny bits of reddish-brown powder that come off old metal when it gets rusty.
The old bike left a patch of rustdust on the garage floor.
OTHER MEANINGS
2. A fine reddish powder used as a pigment in paints and dyes.
The artist mixed rustdust with oil to paint the old barn.
3. A dusty, reddish haze carried by the wind in dry, iron-rich regions.
A cloud of rustdust blew across the desert road.
4. Figurative: a lingering trace of decay or neglect.
Years of rustdust had settled over the forgotten factory.