peb·ble /ˈpɛbəl/
 小圓石,小鵝卵石
 Peb·ble, v. t. [imp. & p. p. Pebbled; p. pr. & vb. n. Pebbling.] To grain (leather) so as to produce a surface covered with small rounded prominences.
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 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.
 pebble
      n : a small smooth rounded rock