This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Worn or smoothed by the action of water.

adj. Worn, smoothed, or polished by the action of water.

Worn by the action of water; especially, smoothed by the force or action of running water, or water in motion: as, water-worn pebbles.

adj. (of rocks especially) worn smooth by the action of water

"Through the bowels of the Great Alpine Reef, they spun, slipping along the smooth, waterworn sides."

worn   

wave-worn    water-polished    ice-coated    schistose    aluminous    steep-walled    lichen-covered    dampish    weed-choked    snow-filled