cinereous
adjective
ci·ne·re·ous sə-ˈnir-ē-əs 
1
: gray tinged with black
2
: resembling or consisting of ashes
Example Sentences
Recent Examples on the Web Some are the polar bears and harbor seals; the cheetahs, Thomson's gazelles, southern ground hornbills and cinereous vultures; and the African lions, waterbuck, kudu and zebra. 
Amy Schwabe, Milwaukee Journal Sentinel, 29 Dec. 2021 The griffon vultures’ continued success in the region also offers hope for the cinereous and bearded vultures, both of which are native to Bulgaria but are now found only in Asia. Lindsey Mcginnis, The Christian Science Monitor, 9 June 2021
Amy Schwabe, Milwaukee Journal Sentinel, 29 Dec. 2021 The griffon vultures’ continued success in the region also offers hope for the cinereous and bearded vultures, both of which are native to Bulgaria but are now found only in Asia. Lindsey Mcginnis, The Christian Science Monitor, 9 June 2021 Word History
Etymology
Latin cinereus, from ciner-, cinis
First Known Use
1661, in the meaning defined at sense 1