Pebble

n.	1.	A small roundish piece of stone; especially, a stone worn and rounded by the action of water; a pebblestone. 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.
v. t.	1.	To grain (leather) so as to produce a surface covered with small rounded prominences. [imp. & p. p. Pebbled; p. pr. & vb. n. Pebbling.]

Noun

1.

pebble - a small smooth rounded rock

Pebble - A polymorphic language. ["A Kernel Language for Abstract Data Types and Modules", R.M. Burstall & B. Lampson, in Semantics of Data Types, LNCS 173, Springer 1984].

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