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Video shows a shelf cloud - a type of arcus cloud - form before a thunderstorm hit Portland.

To Cassiopeia, she added, “Next time, try pluvius arcus, dear; the meaning is clearer.”

In elderly persons we ought always to look for the arcus senilis, which is a sign of a tendency to fatty degeneration.

Moreover, there is the arcus senilis, the fine translucent to opaque circle surrounding the outer portion of the iris.

Because xanthelasmata are composed of foam cells similar to those present in atherosclerotic plaque, they may be a better marker than arcus corneae of the intra-arterial atherosclerotic process.”