French for "raven". In English used to refer to a black-green colour similar to the sheen of oil, or that of a raven's feathers.
From the Latin corvus meaning raven.
"After finishing her greatest painting yet, "Green Cow Travels Through Black Hole" Alison marvelled at the corbeau water swirling in the jar she used to clean her brushes. She was very, very high."
Love Tahlia, no spiel today because I'm too tired.