DAEDRIC FUN TIP:
Moderators can add new Daedric Fun Tips. Kazerad probably won't even notice, and the site does not log who added them.

monochrome

Any image composed of one colour. Whether it's black and white, blue and white, red and white or anything else and white, as long as it's lacking color variety, it's monochrome.

Note:
Images that fit the above description but have color elsewhere (such as the example below) are still considered monochrome as we're only really interested in the subject of the image. Not the unrelated parts that may have also been photographed.