An arcus is a medical term for a white band of cholesterol which forms at the edge of the cornea, or a meteorological term for a low horizontal cloud forming at the leading edge of thunderstorm outflow.
If you mean What is the Latin for rainbow, it is arcus pluvius, or arcus alone, Arcus is a 4th declension noun, so its plural is not "arci" but arcus.
The Romans associated Arcus with Iris.
Arcus Odyssey was created in 1991.
Arcus Odyssey happened in 1991.
Arcus Argentariorum was created in 204.
Arcus-Air Logistic was created in 1973.
Rainbow = Arcus Iris; also either word alone. Horace used "arcus pluvius," however most Romans probably just said "arcus."
Arcus is not a Greek god, but a roman god. She corresponds to Iris, goddess of the rainbow - messenger of the gods, in Greek mythology.
Arcus (-i, m).
Rainbow = Arcus Iris
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