The boundary of a convex set is always a convex curve. The intersection of all convex sets containing a given subset A of Euclidean space is called the convex hull of A. It is the smallest convex set containing A.
Rector (ecclesiastical) A rector is, in an ecclesiastical sense, a cleric who functions as an administrative leader in some Christian denominations, and in Islam. In contrast, a vicar is also a cleric but functions as an assistant and representative of an administrative leader.
minister, minister of religion, parson, pastor, rector. 1  clergyman, man of the cloth, reverend - a member of the clergy and a spiritual leader of the Christian Church. 2  ministrant - someone who serves as a minister.