"instrument for bringing up or removing solid matter from under water by dragging the bottom," late 15c., in Scottish dreg-boat "boat for dredging," perhaps ultimately from root of drag (possibly via Middle Dutch dregghe "drag-net").
dredge (v.)
"to clear out with a dredge, gather with a dredge," also figurative, c. 1500 in Scottish, from dredge (n.). Related: Dredged; dredging.
dredge the chicken in flour before frying it
dreamy
drear
dreariness
dreary
dreck
dredge
dredger
dree
dreg
dregs
drek