1. luxurious apartments on the top floor of a tall building
2. small structures built on the roof of a building
Usage: architectural

Examples

• The penthouses in that skyscraper cost millions of dollars.
• She dreamed of living in one of those penthouses with panoramic city views.
• The building’s penthouses feature private elevators and terraces.
• Many celebrities own penthouses in Manhattan.
• The penthouses on the roof house the building’s mechanical equipment.
• Those penthouses were added to cover the elevator machinery.