RhymeZone: greyscale definitions

Definitions of greyscale:

noun: Alternative spelling of grayscale. [(photography) A printed strip of graduated tones used to check exposure and development times.]
adjective: Alternative spelling of grayscale. [(imaging) Black and white, representing color with shades of gray.]
verb: Alternative spelling of grayscale. [(transitive) To convert to grayscale.]

(Definitions from Wiktionary)