The term MAP PRESSURE LINE is composed of three words: MAP, PRESSURE, and LINE. The first word, MAP, is a representation of an area, usually drawn or printed on a flat surface, that shows physical features, political boundaries, and other details of a place. The second word, PRESSURE, is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. The third word, LINE, is a mark or stroke made on a surface by a pen, pencil, or brush. The crossword solution for this term is ISOBAR, which is a LINE on a MAP connecting points of equal atmospheric PRESSURE.