1. a series of four related literary or dramatic works
2. a group of four related things
3. a congenital heart defect involving four abnormalities
Usage: medical

Examples

• Wagner’s Ring cycle is a famous tetralogy of operas.
• The author completed his tetralogy about the Civil War.
• Shakespeare’s second historical tetralogy includes Henry IV and Henry V.
• The filmmaker planned a tetralogy spanning four decades.
• Tetralogy of Fallot is a serious heart condition in newborns.
• The doctor explained the four components of the cardiac tetralogy.
• This tetralogy of novels follows the same family through generations.