A type of porous, lightweight stone that can float on water, used historically for various purposes or found naturally.
Compound from float + stone (Old English stan). This describes a geological phenomenon where certain volcanic or pumice-like stones have such low density they can float, used in traditional building and trade.
Pumice floatstones were incredibly important to ancient Polynesians—they could float on ocean currents for years, carrying seeds, organisms, and sometimes washing ashore far from volcanic origins, creating biological connections between distant islands.
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