mon·o·chrome 
(mŏnə-krōm′)
(mŏnə-krōm′)n.
1.
a. A picture, especially a painting, done in different shades of a single color.
b. The art or technique of executing such a picture.
2. The state of being in a single color.
3. A black-and-white image, as in photography or on television.
[Medieval Latin monochrōma, from feminine of Greek monokhrōmos, of one color : mono-, mono- + khrōma, color.]
mono·chrome′, mon′o·chromic (-krōmĭk) adj.