[bohl-der] 
| a detached and rounded or worn rock, esp. a large one. |
[bohl-der] | a city in N Colorado. 76,685. |
| boul·der also bowl·der (bōl'dər) n. A large rounded mass of rock lying on the surface of the ground or embedded in the soil. [Middle English bulder, of Scandinavian origin; see bhel-2 in Indo-European roots.] |
| Boul·der (bōl'dər) A city of north-central Colorado northwest of Denver. It is a major Rocky Mountains resort and the seat of the University of Colorado (opened 1877). Population: 91,500. |
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