ho·ly·stone /ˈholiˌston/
磨石(vi.)用磨石磨
Ho·ly·stone n. Naut. A stone used by seamen for scrubbing the decks of ships.
Ho·ly·stone, v. t. Naut. To scrub with a holystone, as the deck of a vessel.
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holystone
n : a soft sandstone used for scrubbing the decks of a ship
v : scrub with a holystone; "holystone the ship's deck"