Definitions

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Borrowed from Latin arcus.

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