MARE
- a dark area on the surface of the moon or Mars [n MARES, MARIA] / a mature female horse [n MARES]
- a female horse [n -S] / a dark area on the Moon or Mars [n MARES or -S or MARIA]
- female horse
- (Sea of Sirens) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth
- an evil preternatural being causing nightmares