(1):

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

(2):

(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.

(3):

(n.) The god of war and husbandry.