Keel v. t. & i. : To cool; to skim or stir.

Keel n. : A brewer's cooling vat; a keelfat.

Keel n. : A longitudinal timber, or series of timbers scarfed together, extending from stem to stern along the bottom of a vessel. It is the principal timber of the vessel, and, by means of the ribs attached on each side, supports the vessel's frame. In an iron vessel, a combination of plates supplies the place of the keel of a wooden ship. See Illust. of Keelson.

Keel n. : Fig.: The whole ship.

Keel n. : A barge or lighter, used on the Type for carrying coal from Newcastle; also, a barge load of coal, twenty-one tons, four cwt.

Keel n. : The two lowest petals of the corolla of a papilionaceous flower, united and inclosing the stamens and pistil; a carina. See Carina.

Keel n. : A projecting ridge along the middle of a flat or curved surface.

Keel v. i. : To traverse with a keel; to navigate.

Keel v. i. : To turn up the keel; to show the bottom.

Example:
why is it important to protect the Keel billed toucan?

Taxonomy
keel, hull, fin keel, swing keel, sailing, lay the keel, False keel, free encyclopedia, ballast, Sailboat, boat, Hydrodynamic, flat plate, stability, force of the wind, structural element, language, double bottom.

Defination from the web:
keel is the initial step in construction of a ship, the construction is dated from this event, with only the ship's ... The keel runs in the middle of the ship, from the bow to the stern, and serves as the foundation or spine of the structure, providing the major ...