÷te.ˈträləjē, -ral-, -ji noun
( -es )
Etymology: Greek tetralogia, from tetra- + -logia -logy
1. : a group of four dramatic pieces including three tragedies and one satyric piece or sometimes four tragedies represented consecutively on the Attic stage at the Dionysiac festival
2. : a series of four connected works (as dramas, operas, or novels)
3. : a group of four symptoms that are characteristic of a disease ; specifically : tetralogy of fallot