Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A flat arid valley surrounded by mountains and draining into a shallow central lake.

from The Century Dictionary.

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

Etymologies

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

[American Spanish bolsón, augmentative of Spanish bolsa, purse, pouch, from Late Latin bursa; see bursa.]

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