What does "shoveler" mean?

Shoveler: (Zoöl.) A river duck (Spatula clypeata), native of Europe and America. It has a large bill, broadest towards the tip. The male is handsomely variegated with green, blue, brown, black, and white on the body; the head and neck are dark green. Called also broadbill, spoonbill, shovelbill, and maiden duck. The Australian shoveler, or shovel-nosed duck (S. rhynchotis), is a similar species.