Mar (n.) A small lake. See Mere.

Mar (v.) To make defective; to do injury to, esp. by cutting off or defacing a part; to impair; to disfigure; to deface.

Mar (v.) To spoil; to ruin.

Mar (n.) A mark or blemish made by bruising, scratching, or the like; a disfigurement.

Mars (n.) The god of war and husbandry.

Mars (n.) One of the planets of the solar system, the fourth in order from the sun, or the next beyond the earth, having a diameter of about 4,200 miles, a period of 687 days, and a mean distance of 141,000,000 miles. It is conspicuous for the redness of its light.

Mars (n.) The metallic element iron, the symbol of which / was the same as that of the planet Mars.