arcus

  1. Noun.  (medicine) A white band of cholesterol that forms at the edge of the cornea.
  2. Noun.  (meteorology) A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow.
  3. Noun.  (entomology) An elastic band around the base of the arolium, a pad at the end of the leg of certain insects.
  4. Noun.  (palynology, plural sometimes arci) An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore.

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This entry was last updated on RefTopia from its source on 3/20/2012.