Isthmus Definition
 ĭsməs 
  isthmi, isthmuses
  
    noun
  
 
    isthmuses
  
A narrow strip of land having water at each side and connecting two larger bodies of land.
 Webster's New World 
A narrow strip of tissue connecting two larger parts of an organ.
 The isthmus of the thyroid.
 Webster's New World 
A narrow passage between two larger cavities.
 The isthmus of the fallopian tubes.
 Webster's New World 
Synonyms: 
  
- band
- portage
- neck of land
- land-bridge
- land passage
Other Word Forms of Isthmus
Noun
Singular:
 isthmusPlural:
 isthmi, isthmusesOrigin of Isthmus
-  Via Latin isthmus, from Ancient Greek ἰσθμός (isthmos, “neck”). Cognate to Old Norse eið (“isthmus”). From Wiktionary 
- Latin from Greek isthmos - From American Heritage Dictionary of the English Language, 5th Edition 
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