cobble

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cobble

1. short for cobblestone
2. Geology a rock fragment, often rounded, with a diameter of 64--256 mm and thus smaller than a boulder but larger than a pebble

cobble

Stone that is smaller than a boulder but larger than gravel. See also: Stone

cobble

[′käb·əl]
(geology)
A rock fragment larger than a pebble and smaller than a boulder, having a diameter in the range of 64-256 millimeters (2.5-10.1 inches), somewhat rounded or otherwise modified by abrasion in the course of transport.

cobble, cobblestone

1.A rock fragment between 2 ½ and 10 in. (64 and 256 mm) in diameter, used for rough paving, walls, and foundations.
2. Coarse aggregate for concrete, having a nominal size in the range 3 to 6 in. (75 to 150 mm).