A panel for the display of advertisements in public places, such as alongside highways or on the sides of buildings. The advertisement or message posted on such a panel. An introductory list of highlights from the program or text that follows, as in a broadcast or magazine. To advertise or proclaim on or as if on a billboard: billboarded as the workers' candidate. Nautical A ledge on the bow of a ship on which the bill of an anchor rests when the anchor is secured to the cathead.