Origin: Greek prefix mono-
Monochrome has 5 different meanings across 2 categories:
painting done in a range of tones of a single color
"The artist chose to paint her latest portrait entirely in shades of burnt orange, creating a striking monochrome effect that made the subject's eyes pop."
a black-and-white photograph or slide
"The old camera only produced monochrome photos, so every memory in that album is in shades of gray."
A black and white image, especially such a photograph.
"The artist decided to convert her entire gallery into monochrome displays featuring only stark black and white photographs."
having or appearing to have only one color
"The artist chose a monochrome palette for the painting, limiting every stroke to varying shades of deep blue."
Having only one colour.
"The photographer chose a monochrome filter to turn the entire landscape into shades of gray."