(mathematics) The smallest convex set of points in which a given set of points is contained.

plural of convex hull

plural of turtle hull

plural of rice hull

The hard protecting covering of a grain of rice.

plural of hull breach

plural of pressure hull

A secondary hull in a submarine, inside the main outer hull, that withstands the outside pressure and has normal atmospheric pressure inside.

plural of hull speed

(nautical) The speed at which the wavelength of a vessel's bow wave is equal to the boat length. In the sailship era the hull speed was regarded as an approximate limit for the speed a ship could reach.