arcus

Meaning

Noun

• A white band of cholesterol that forms at the edge of the cornea
• A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow
• An elastic band around the base of the arolium, a pad at the end of the leg of certain insects
• An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore

Origin

• Borrowed from Latin arcus. arc, and arco. Distantly related to arrow.