Alternative letter-case form of Mason-Dixon Line

(military, weaponry) direction in which a weapon fires / (figuratively, by extension) position vulnerable to attack

(fine arts) An abstract line supposed to be beautiful in itself and absolutely; differently represented by different authors, often as a kind of elongated S (like the one drawn by Hogarth).

(military) The position of troops drawn up in their usual order without any determined maneuver. / (naval) The line or arrangement formed by vessels of war in an engagement.

(palmistry) A line on the palm of the hand, curving about the base of the thumb, supposed to indicate, by its form or position, the length of a person's life.

(nautical, military, obsolete) A ship of the line or battleship.

(shipbuilding) the outline of a horizontal section of a vessel, as when floating in the water.

A sea lion, Otaria flavescens, found on the Chilean, Peruvian, Uruguayan and Argentine coasts, with a very large head with an upturned snout.

(historical) The boundary line between Pennsylvania and Maryland, as run (1764–1767) by Charles Mason and Jeremiah Dixon, that, before abolition, defined part of the northern boundary of states in which slavery was permitted.

(shipbuilding) a model of a vessel formed of boards which are shaped according to the water lines as shown in the plans and laid upon each other to form a solid model