DICT.TW Dictionary Taiwan

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