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Meaning of isthmus

isth•mus

Pronunciation: (is'mus), [key]
— pl. -mus•es, -mi
  1. a narrow strip of land, bordered on both sides by water, connecting two larger bodies of land.
  2. a connecting, usually narrow, part, organ, or passage, esp. when joining structures or cavities larger than itself.
  3. the narrow fleshy area between the sides of the lower jaw of a fish.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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