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plural tetralogies
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.
(historical) A group of four dramas, three tragic and one satiric, exhibited together at the festivals of Dionysus at Athens.
(medicine) A combination of four symptoms. examples
(medicine, colloquial) Tetralogy of Fallot. examples