cinerulent
Full of ashes; resembling ashes.
obsolete
The best [form of cadmia] is the botritis, thick, moderately heavy, smooth, of a racemose superficies, which being broken is cinerulent.
Where it comes from
Borrowed from Latin cinerulentus, from cinis (“ashes”) (oblique stem ciner-) + -ulentus.
Adapted from the Wiktionary entry cinerulent (CC BY-SA 4.0).