Glaucous

Glaucous (from the Latin glaucus, meaning "bluish-grey or green", from the Greek glaukos) is used to describe the pale grey or bluish-green appearance of the surfaces of some plants, as well as in the names of birds, such as the Glaucous Gull (Larus hyperboreus), Glaucous-winged Gull (Larus glaucescens), Glaucous Macaw (Anodorhynchus glaucus), and Glaucous Tanager (Thraupis glaucocolpa).