tetralogy

From tetra- +‎ -logy.

• enPR: tĕ-trălʹ-ə-jē, IPA^(key): /tɛˈtɹælədʒi/

tetralogy (plural tetralogies)

1. A set of four works of art that are connected, and that can be seen either as a single work or as four individual works. They are commonly found in literature, film, or video games.
   1. (historical) A group of four dramas, three tragic and one satiric, exhibited together at the festivals of Dionysus at Athens.
2. (medicine) A combination of four symptoms.
3. (medicine, colloquial) Tetralogy of Fallot.

• (four related works): quadrilogy (nonstandard)

• dilogy (2)
• trilogy (3)
• quadrilogy (4)
• pentalogy (5)
• hexalogy (6)
• heptalogy (7)
• octalogy (8)
• ennealogy (9)
• decalogy (10)
• polylogy (2+)