Meaning ofarcusin English

Noun

1. a low, horizontal cloud; thunderstorm sign
   The dark arcus cloud indicated an approaching thunderstorm.
2. a white cholesterol band on the cornea; eye condition
   The ophthalmologist diagnosed an arcus in the patient's eye.
3. an elastic band around an insect's leg base
   Entomologists study the arcus that supports insect legs.
4. an arc-shaped band on pollen grains or spores
   Botanists examine the arcus on pollen grains under a microscope.