boulder
boul•der (bōl´dər) n.
[[ME bulder, short for bulderston < Scand, as in Swed bullersten, lit., noisy stone < bullra, to roar (akin to bellow) + sten, stone]]
1 any large rock worn smooth and round by weather and water
2 Geol. such a rock larger than a cobblestone with a diameter of at least 256 mm (c. 10 in)
