PEBBLE

pebble|pebblestone. Pebble, or Pebblestone, n. a fort of hard small stone

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Peb″ble (?), n. [[AS. papolstān; cf. L. papula pimple, mote. See Stone.]] 1. 1. A small roundish stone or bowlder; especially, a stone worn and rounded by the action of water; a pebblestone. “The pebbles on the hungry beach.” Shak.
As children gathering pebbles on the shore. Milton. 2. 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.