[te-tral-uh-jee, -trah-luh-]
noun, plural tetralogies.
a series of four related dramas, operas, novels, etc.
a group of four dramas, three tragedies and one satyr play, performed consecutively at the festival of Dionysus in ancient Athens.

1650–60; < Greek tetralogía. See tetra-, -logy

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World English Dictionary
tetralogy (tɛˈtrælədʒɪ)
n , pl -gies
1.  a series of four related works, as in drama or opera
2.  (in ancient Greece) a group of four dramas, the first three tragic and the last satiric
3.  pathol a group of four symptoms present in one disorder, esp Fallot's tetralogy
[C17: from Greek tetralogia; see tetra-, -logy]

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American Heritage
Medical Dictionary

tetralogy te·tral·o·gy (tě-trāl'ə-jē, -trŏl'-)
A complex of four symptoms.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Even this lacks the satyr play which once made the group a normal tetralogy.
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