Wa"ter gall` (?).
1.
A cavity made in the earth by a torrent of water; a washout.
2.
A watery appearance in the sky, accompanying the rainbow; a secondary or broken rainbow.
These water galls, in her dim element,
Foretell new storms to those already spent.
Shak.
False good news are [is] always produced by true good, like the water gall by the rainbow.
Walpole.
© Webster 1913.