home m Josh Murfitt mast [mast, mahst] –noun 1. Nautical. a. a spar or structure rising above the hull and upper portions of a ship or boat to hold sails, spars, rigging, booms, signals, etc., at some point on the fore-and-aft line, as a foremast or mainmast. b. any of a number of individual spars composing such a structure, as a topmast supported on trestletrees at the head of a lower mast. c. any of various portions of a single spar that are beside particular sails, as a top-gallant mast and royal mast formed as a single spar. 2. the fruit of the oak and beech or other forest trees, used as food for hogs and other animals. 3. any upright pole, as a support for an aerial, a post in certain cranes, etc. a b c d e f g h i j k l m n o p q r s t u v w x y z magic mast mask melon meadow meat memorial mermaid merchandise metal milky mir-mz midnight