Entry 2 senses · 2 variants Webster, 1913 Holystone · Ho·ly·stone · IPA /ˈhoʊl.i.stoʊn/ n. v. t. 01 n. A stone used by seamen for scrubbing the decks of ships. 1. A stone used by seamen for scrubbing the decks of ships.(Naut.) 02 v. t. To scrub with a holystone, as the deck of a vessel. 1. To scrub with a holystone, as the deck of a vessel.(Naut.)