
1) Arc
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https://www.crosswordclues.com/clue/fogbow

• (n.) A nebulous arch, or bow, of white or yellowish light sometimes seen in fog, etc.
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http://thinkexist.com/dictionary/meaning/fogbow/

A rainbow that has a white band that appears in fog, and is fringed with red on the outside and blue on the inside.
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http://www.encyclo.co.uk/local/22268
Fog'bow` noun A nebulous arch, or bow, of white or yellowish light sometimes seen in fog, etc.
Found on
http://www.encyclo.co.uk/webster/F/52

A rainbow that has a white band that appears in fog, and is fringed with red on the outside and blue on the inside
Found on
http://www.timeanddate.com/weather/glossary.html

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
Found on
https://www.infoplease.com/dictionary/fogbow
No exact match found.