'Slate-gray' definitions:

Definition of 'slate-gray'

(from WordNet)
adjective
Of the color of slate or granite; "the slaty sky of dawn" [syn: slate-grey, slate-gray, slaty-grey, slaty- gray, slaty, slatey, stone-grey, stone-gray]

Definition of 'Slate-gray'

From: GCIDE
  • Slate-gray \Slate"-gray`\, a. Of a dark gray, like slate. [1913 Webster]