fogdog

[fog-dawg, -dog, fawg] /ˈfɒgˌdɔg, -ˌdɒg, ˈfɔg/
noun
1.
a bright spot sometimes seen in a fog bank.
Origin
1865-70; see fog1, sundog
British Dictionary definitions for fogdog

fogdog

/ˈfɒɡˌdɒɡ/
noun
1.
a whitish spot sometimes seen in fog near the horizon Also called seadog