Tetralogy Definition
 tĕ-trălə-jē, -trŏl- 
  tetralogies
  
    noun
  
 A series of four dramas, three tragic and one satirical, performed in sequence at the ancient Athenian festival of Dionysus.
 Webster's New World 
Any series of four related plays, novels, etc.
 Webster's New World 
A complex of four symptoms.
 American Heritage Medicine 
Other Word Forms of Tetralogy
Noun
Singular:
 tetralogyPlural:
 tetralogiesOrigin of Tetralogy
-  
Greek tetralogiā tetra- tetra- -logos word, saying –logy
From American Heritage Dictionary of the English Language, 5th Edition
 From tetra- +"Ž -logy.
From Wiktionary
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