What is the meaning of Pebble?

A small stone, especially one rounded by the action of water.

A particle from 4 to 64 mm in diameter, following the Wentworth scale.

A small droplet of water intentionally sprayed on the ice that cause irregularities on the surface.

Transparent and colourless rock crystal.

A form of slow-burning gunpowder in large cubical grains.

A small piece of crack cocaine.

To pave with pebbles.

To deposit water droplets on the ice.

To give (leather) a rough appearance with small rounded prominences.

To place a pebble at (a vertex of a graph) according to certain rules, in a pebble game.

Source: wiktionary.org