a sieve
"The new filter acts as a ridder of dust from our living room air."
One who, or that which, rids.
to sieve; sift; riddle
"She used a fine mesh screen to ridder out any remaining bits of husk from the ground coffee beans before brewing."
A surname.
"The local history museum recently featured a painting of Sir Thomas Ridder, honoring his contributions to the region's agriculture in the early 1800s."