Keels n. pl. : Ninepins. See Kayles.

Example:
Can you encapsulate Iron Keels with fiberglass?

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:
keels are provided in the bottom of some vessels. ... In sailboats, keels use the forward motion of the boat to generate lift to counter act the leeward force of the wind. ... Keels may be fixed, or non-movable, or they may retract to allow sailing in shallower waters. ...