Arcus
noun
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A white band of cholesterol that forms at the edge of the cornea.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
An elastic band around the base of the arolium, a pad at the end of the leg of certain insects.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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