noun. A floating structure, such as a flatbottom boat, used to support a bridge.

noun. A floating structure serving as a dock.

noun. Either of two floating structures attached to a seaplane.

noun. Same as catamaran, 4.

noun. In milit engin., a flat-bottomed boat, or any light framework or floating structure, used in the construction of a temporary bridge over a river.

noun. Nautical, a lighter; a low flat vessel resembling a barge, furnished with cranes, capstans, and other machinery, used in careening ships, chiefly in the Mediterranean.

noun. In hydraulic engineering: A water-tight structure or frame placed beneath a submerged vessel and then filled with air to assist in refloating the vessel.

noun. A water-tight structure which is sunk by filling with water and raised by pumping it out, used to close a sluiceway or entrance to a dock. Also spelled ponton.

noun. In anatomy, a loop or knuckle of the small intestine: so called from the way it appears to float in the abdominal cavity. See the quotation under mesentery.

noun. In brewing, one of the cleansing-rounds or cleansing-squares used for clarifying ale.

noun. A wooden flat-bottomed boat, a metallic cylinder, or a frame covered with canvas, India rubber, etc., forming a portable float, used in building bridges quickly for the passage of troops.

noun. A low, flat vessel, resembling a barge, furnished with cranes, capstans, and other machinery, used in careening ships, raising weights, drawing piles, etc., chiefly in the Mediterranean; a lighter.

noun. a bridge formed with pontoons.

noun. the carriages of the pontoons, and the materials they carry for making a pontoon bridge.

noun. A card game in which the object is to obtain cards whose value adds up to, or nearly to, 21 but not exceed it.

noun. A flat-bottomed boat used as a support for a temporary bridge.

noun. A floating structure supporting a bridge or dock.

noun. A box used to raise a sunken vessel.

noun. A float of a seaplane.

noun. a float supporting a seaplane

noun. (nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge

"The party boat is what we called the pontoon boat."