1 Definition in the Yahoo! Kids Dictionary
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"KIDS HOME STUDY REFERENCE DICTIONARY HOME WORD: isthmus

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isth·mus  audio 
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NOUN:
pl. isth·mus·es or isth·mi
  1. A narrow strip of land connecting two larger masses of land.
  2. Anatomy
    1. A narrow strip of tissue joining two larger organs or parts of an organ.
    2. A narrow passage connecting two larger cavities.

ETYMOLOGY:
Latin, from Greek isthmos
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