资料来源 : Webster's Revised Unabridged Dictionary (1913)

Slate-gray \Slate"-gray`\, a.
   Of a dark gray, like slate.

资料来源 : WordNet®

slate-gray
     adj : of the color of slate or granite; "the slaty sky of dawn"
           [syn: {slaty}, {slatey}, {stone-gray}]