Answer: tetralogies

AnswerCrossword Clue
tetralogiesA series of four ancient Greek dramas, three tragedies and one satyr play, originally presented together
tetralogiesA group of four related literary or operatic works
tetralogiesTETRALOGY, a series of four connected literary, artistic, or musical works
tetralogiesA set of four related symptoms or abnormalities frequently occurring together