Definitions for fogbowˈfɒgˌboʊ, ˈfɔg-
Random House Webster's College Dictionary
a bow or arc of white or yellowish hue seen in or against a fog bank; a rainbow formed by fog droplets.
Origin of fogbow:
1825–35; fog+ (rain )bow
A white arc or circle, similar to a rainbow, which can appear in the sky in foggy conditions as sunlight passes through small airborne water droplets.