- a moderate to dark grayish blue.
Origin of slate blue
First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for slate blue
The hair had slipped from its body, leaving the skin shiny and slate-blue.The Yellow Horde
Hal G. Evarts
A petrel it is, about the size of a house pigeon, and of a slate-blue colour.The Land of Fire
The male is of a slate-blue, and has a broad black band across the tail.Birds in Flight
W. P. Pycraft
There was a smile on her lips, but there was fiery challenge in her slate-blue eyes.
Slate-blue eyes, two books with endless pages, the soul of this wife of his.