from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from The Century Dictionary and Cyclopedia

  • n. In anatomy, an arch, bow, or ring.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a whitish deposit in the shape of an arc that is sometimes seen in the cornea


Borrowed from Latin arcus. (Wiktionary)


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