Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "slate-gray" in a sentence
"The setting for "EXIT," by Dane Laffrey, has a slate-gray hue and looks like a slick back room in a club where the only way out is a single emergency door."
"I looked back to shore and saw we now had this enormous slate-gray thunderhead approaching us."
"Joe Kohen for The Wall Street Journal The author with the third car of his 24-year marriage, a slate-gray Subaru Forester he picked up on Friday."