Definition of "arcus" [arcus]

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

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• "Title: Xanthelasmata, arcus corneae, and ischaemic vascular disease and death in general population: prospective cohort study"
• "Caveat: The diagnosis of xanthelasmata and arcus corneae was based on a visual inspection, and milder cases may have been missed, researchers said."
• "The study also looked at arcus corneae, a white ring around the iris, and found it wasn't significantly associated with cardiovascular disease."