Knowledge Base
keel
A longitudinal timber or plate extending along the center of the bottom of a ship and often projecting from the bottom.

knot
(1) A measure of speed equal to one nautical mile (6076 feet) per hour,(2) A fastening made by interweaving rope to form a stopper, to enclose or bind an object, to form a loop or a noose, to tie a small rope to an object, or to tie the ends of two small ropes together.

 
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