Glaucous (from Latin glaucus, from Ancient Greek γλαυκός (glaukós) 'blue-green, blue-grey') 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).

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Quick Facts Color coordinates, Hex triplet ...

Glaucous
Color coordinates
Hex triplet	#6082B6
sRGBB (r, g, b)	(96, 130, 182)
HSV (h, s, v)	(216°, 47%, 71%)
CIELChuv (L, C, h)	(54, 51, 250°)
Source	ISCC-NBS
ISCC–NBS descriptor	Moderate blue
B: Normalized to [0–255] (byte)

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The term glaucous is also used botanically as an adjective to mean "covered with a greyish, bluish, or whitish waxy coating or bloom that is easily rubbed off" (e.g. glaucous leaves).^[1][2]

The first recorded use of glaucous as a color name in English was in the year 1671.^[3]

The epicuticular wax coating on mature plum fruit gives them a glaucous appearance. Another familiar example is found in the common grape genus (Vitis vinifera). Some cacti have a glaucous coating on their stem(s). Glaucous coatings are hydrophobic so as to prevent wetting by rain. Their waxy character serves to hinder climbing of leaves, stem or fruit by insects. On fruits, glaucous coatings may function as a deterrent to climbing and feeding by small insects in favor of increased seed dispersal offered by larger animals such as mammals and birds.

The blue-grey camouflage coloring of some species of birds and sea and land animals causes their appearance to blend with their surroundings, making their detection by predators or prey difficult.

• Wine grapes with glaucous coating
• Plums with some glaucous coating visible
• Sedum spathulifolium is a glaucous perennial herbaceous plant.
• Glaucous gull (Larus hyperboreus)
• Blue shark (Prionace glauca)

• Lists of colors
• Glaucus (disambiguation)