the GNU version of the Collaborative International Dictionary of English
adj. Like ashes; ash-colored; cinereous.
The Century Dictionary and Cyclopedia
Of ashes; ashy; cinereous.
Word Usage
"To the east of this water, black cineraceous earth shows where the smith had been at work: we applied the quarrymen to sift it, without other results but bits of glass, copper, and iron nails."