/mahrz/ , n.
1. the ancient Roman god of war and agriculture, identified with the Greek god Ares.
2. Astron. the planet fourth in order from the sun, having a diameter of 4222 miles (6794 km), a mean distance from the sun of 141.6 million miles (227.9 million km), a period of revolution of 686.95 days, and two moons. See table under planet (def. 1).
adj.
3. ( often l.c. ) of or pertaining to any of various pigments used in painting that are artificially made from an iron oxide base: Mars color; Mars pigments.