Mars \Mars\, n. [L. Mars, gen. Martis, archaic Mavors, gen. Mavortis.]

1. (Rom. Myth.) The god of war and husbandry.

2. (Astron.) 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.

3. (Alchemy) The metallic element iron, the symbol of which [male] was the same as that of the planet Mars. [Archaic] --Chaucer.

Mars brown, a bright, somewhat yellowish, brown.

Source: Webster's Revised Unabridged Dictionary (1913)