(mathematics) The smallestset, geometric shape, or algebraic entity having a particular property (such as convexity) that contains a specified set, shape, or algebraic entity. Thus, for example, the orthogonal convex hull of an orthogonal polygon is the smallest orthogonally convex polygon that encloses the original polygon.
Verb
(obsolete, intransitive, nautical) To drift; to be carried by the impetus of wind or water on the ship's hull alone, with sails furled.
(transitive) To hit (a ship) in the hull with cannon fire etc.