Monochrome
Part of speech: noun
Definition: A black and white image, especially such a photograph. A painting executed in shades of a single colour. A ceramic glaze of a single colour; an object so glazed.
Part of speech: adjective
Definition: having only one colour representing colours with shades of gray
Grayscale
Part of speech: adjective
Definition: (imaging) black and white, representing color with shades of gray.
Part of speech: verb
Definition: To convert to grayscale.
Part of speech: noun
Definition: A printed strip of graduated tones used to check exposure and development times.