(of photographs, etc. 照片等 using only black, white and shades of grey 黑白的 monochrome illustrations/images 黑白插图／肖像 - (figurative)
a dull monochrome life 枯燥单调的生活
using different shades of one colour 单色的
Word Originmid 17th cent.: based on Greek monokhrōmatos ‘of a single colour’.