01 n. A small roundish piece of stone; especially, a stone worn and rounded by the action of water; a pebblestone.
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1.
A small roundish piece of stone; especially, a stone worn and rounded by the action of water; a pebblestone.“As children gathering pebbles on the shore.” — Milton.
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2.
Transparent and colorless rock crystal; as, Brazilian pebble; -- so called by opticians.
Phrases & compounds
Pebble powder —
slow-burning gunpowder, in large cubical grains.
Scotch pebble —
varieties of quartz, as agate, chalcedony, etc., obtained from cavities in amygdaloid.