Science Dictionary
pebble   (pěb'əl)  Pronunciation Key 
A rock fragment larger than a granule and smaller than a cobble. Pebbles have a diameter between 4 and 64 mm (0.16 and 2.56 inches) and are often rounded.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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