n. 1 top of a ship’s mast, esp. as a place of observation or punishment. 2 title of a newspaper etc. at the head of the front page or editorial page. mastic trnmstik/ n. 1 gum or resin from the mastic tree, used in making varnish. 2 (in full mastic tree) evergreen tree yielding this. 3 waterproof filler and sealant. [Greek mastikhe]