Wă'ter-gall, n.

n. 1. A cavity made in the earth by a torrent of water. 2. A watery appearance in the sky, accompanying the rainbow.

Those water-galls, in her dim element, Foretell new storms to those already spent. Shak.

False good news are always produced by true good, like the water-gall by the rainbow. H. Walpole.