from The Century Dictionary and Cyclopedia
- n. The iris formed by sunlight upon foam or spray, as of a cataract.
Sorry, no etymologies found.
So he cometh his ways to the water, where the glittering foam-bow glows,
And his cheek brighten'd as the foam-bow brightens
Hung, more fair than the foam-bow, a boy in the bloom of his manhood,
Sorceress; and so clad gat them down the rock-hewn stair, Ralph going first, lest there should be any broken place; but naught was amiss with those hard black stones, and they came safely to a level place of the rock, whence they could see the face of the cliff, and how the waters of the Well came gushing forth from a hollow therein in a great swelling wave as clear as glass; and the sun glistened in it and made a foam-bow about its edges.
Socrates in the parable of the Cave) -- in the sun-lit mountain slopes, the pine-woods and the glittering walls of rock, and in the colours of the foam-bow suspended amidst the spray of the swift down-thundering cataract.