arcus
/AA1 R K AH0 S/noun
- 1
(medicine) A white band of cholesterol that forms at the edge of the cornea
- 2
(meteorology) A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow
- 3
(entomology) An elastic band around the base of the arolium, a pad at the end of the leg of certain insects
- 4
(palynology) An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore
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