candock

from The Century Dictionary.

• noun A local English name for one or more species of Equisetum, or horsetails, given because some of the kinds are employed in polishing tin cans and other metallic vessels.
• noun The yellow water-lily, Nuphar luteum: so called from its dock-like leaves and flagon-shaped seed-vessels.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A plant or weed that grows in rivers; a species of Equisetum; also, the yellow frog lily (Nuphar luteum).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A plant or weed that grows in rivers.
• noun A species of Equisetum.
• noun The yellow frog lily (Nuphar luteum).