Definitions

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

  • noun A natural depression in a land surface communicating with a subterranean passage, generally occurring in limestone regions and formed by solution or by collapse of a cavern roof.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage
  • noun A depressed area in which waste or drainage collects.
  • noun pinball A hole in the playfield that rewards the player when the ball is guided into it.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof

Etymologies

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