pebble

Short definition from Wiktionary

Noun

1. 1
   A small stone, especially one rounded by the action of water.
2. 2
   A particle from 4 to 64 mm in diameter, following the Wentworth scale.
3. 3
   A small droplet of water intentionally sprayed on the ice that cause irregularities on the surface.
4. 4
   Transparent and colourless rock crystal.
5. 5
   A form of slow-burning gunpowder in large cubical grains.
6. 6
   A small piece of crack cocaine.

Verb

1. 1
   To pave with pebbles.
2. 2
   To deposit water droplets on the ice.
3. 3
   To give (leather) a rough appearance with small rounded prominences.
4. 4
   To place a pebble at (a vertex of a graph) according to certain rules, in a pebble game.