Dredge
Bouvier's Law Dictionary and Concise Encyclopedia · John Bouvier; revised by Francis Rawle · 1914
Bouvier's Law Dictionary and Concise Encyclopedia
Formerly applied to a net or drag for taking oysters; now a machine for cleansing canals and rivers. To dredge is to gather or take with a dredge, to remove sand, mud, and filth from the beds of rivers, harbors, and canals, with a dredging machine.
15 Can. L. T. 268.