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Any one of several species of Nuphar; the yellow frog lily; -- so called from the shape of the seed vessel. See Nuphar, and cf. Candock. Dr. Prior.

See Canker, n., 1.

spreading gangrenous ulcer or collection of ulcers in or about the mouth; -- called also water canker, canker of the mouth, and noma.

-- Mud drum (Steam Boilers), a drum beneath a boiler, into which sediment and mud in the water can settle for removal. -- Mud eel (Zoöl.), a long, slender, aquatic amphibian (Siren lacertina), found in the Southern United States. It has persistent external gills and only the anterior pair of legs. See Siren. -- Mud…