Definition of cinereous in English:

cinereous

adjective

  • (especially of hair or feathers) ash-gray.

    • ‘The stems are covered with several barks or rinds, the latter being of a cinereous dirt color and very thin.’

Origin

Late Middle English: from Latin cinereus similar to ashes (from cinis, ciner- ashes) + -ous.

Pronunciation:

cinereous

/səˈnirēəs/