Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Chiefly Southwestern U.S. A flat arid valley surrounded by mountains and draining into a shallow central lake.

from The Century Dictionary and Cyclopedia

  • n. In physical geography, a basin-shaped depression inclosed on nearly all sides by mountains.

Etymologies

American Spanish bols├│n, augmentative of Spanish bolsa, purse, pouch, from Late Latin bursa; see bursa.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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