'Bay' in the Bible

I have seen by night, and lo, one riding on a red horse, and he is standing between the myrtles that are in the shade, and behind him are horses, red, bay, and white.

The first chariot had red horses (war, bloodshed), the second chariot had black horses (famine, death),

And in the third chariot white horses; and in the fourth chariot grisled and bay horses.

And the bay went forth, and sought to go that they might walk to and fro through the earth: and he said, Get you hence, walk to and fro through the earth. So they walked to and fro through the earth.