noun
An adult female horse.
But then I had the [massive] flintlock by me for protection. ¶[…]The linen-press and a chest on the top of it formed, however, a very good gun-carriage; and, thus mounted, aim could be taken out of the window at the old mare feeding in the meadow below by the brook, and a 'bead' could be drawn upon Molly, the dairymaid, kissing the fogger behind the hedge,[…].
A foolish woman.
The silly mare phoned your mother, talking about applying for a mortgage, and we don't want that, do we?
noun
A type of evil spirit formerly thought to sit on the chest of a sleeping person; also, the feeling of suffocation felt during sleep, attributed to such a spirit.
A nightmare; a frustrating or terrible experience.
I'm having a complete mare today.
noun
A large, dark plain, which may have the appearance of a sea, such as those on the Moon.
On Saturn's moon Titan, any of several lakes which are large expanses of what is thought to be liquid hydrocarbons.
Kraken Mare (a lake of liquid hydrocarbons on Titan which is slightly larger than the Caspian Sea)