holystone

Noun
  1. A soft sandstone used for scrubbing the decks of a ship (synset 109328135)
    is a type of: sandstone - a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
Verb
  1. Scrub with a holystone (synset 201254079)
    "holystone the ship's deck"
    is a type of: scour, scrub - clean with hard rubbing

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