fogbow

[fog-boh, fawg-] /ˈfɒgˌboʊ, ˈfɔg-/
noun
1.
a bow, arc, or circle of white or yellowish hue seen in or against a fog bank; a rainbow formed by fog droplets.
Also called mistbow, seadog, white rainbow.
Origin
1825-35; fog1 + (rain)bow
British Dictionary definitions for fogbow

fogbow

/ˈfɒɡˌbəʊ/
noun
1.
a faint arc of light sometimes seen in a fog bank Also called seadog, white rainbow
fogbow in Science
fogbow
  (fôg'bō')   
A faint white or yellowish arc-shaped light that sometimes appears in fog opposite the Sun. A fogbow is similar to a rainbow but forms in a cloud or in fog. Also called cloudbow.