1. an extinct flying reptile that lived during the Mesozoic Era, characterized by wings formed by a membrane of skin stretched between an elongated fourth finger and the body
Usage: paleontology

Examples

• The pterosaur soared over ancient seas millions of years ago.
• Scientists discovered a new pterosaur species with a wingspan of over 30 feet.
• Unlike birds, pterosaurs were reptiles that developed the ability to fly.
• The museum’s pterosaur fossil shows the delicate wing membrane structure.
• Pterosaurs ranged in size from sparrow-sized to as large as small airplanes.
• The pterosaur’s hollow bones made it lightweight enough for flight.