MASTER OF A SHIP, mar. law. The commander or first officer of a ship; a captain. (q.v.) 2. His rights and duties have been considered under the article Captain. Vide also, 2 Bro. Civ. Adm. Law, 133; 3 Kent, Com. 121; Wesk. Ins. 360; Park. on Ins. Index, h.t.; Com. Dig. Navigation, I 4.